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Chapter 11: Salt

24 claims, 7 marked for safety

15 confirmed
8 amended
1 unresolved
7 marked for safety

Filter the rows

S1 Safety amended Bench 3

Pink curing salt (6.25 % NaNO₂) at 2.5 g per kg meat, never more than 3 g; about 150 ppm ingoing nitrite

To check against: EU Regulation (EC) 1333/2008 Annex II (E249/E250 limits, 150 mg/kg for most meat products); USDA 9 CFR 424.22; doc 70, 111
The verdict: AMENDED
Found: eur-lex.europa.eu/eli/reg/2023/2108/oj/eng (Commission Reg. (EU) 2023/2108 amending Annex II of 1333/2008, recitals 18 to 21 and Annex, cat. 08.3.1/08.3.2); summary tables cross-checked at heraxfood.com/en/news/lower-maximum-levels-of-nitrites-ap… ; law.cornell.edu/cfr/text/9/424.21 (9 CFR 424.21(c) chart) and law.cornell.edu/cfr/text/9/424.22 (bacon)
Note: The 150 mg/kg EU figure is out of date. Since 9 Oct 2025 the EU maximum added nitrite for meat products is 80 mg/kg expressed as nitrite ion (about 120 mg/kg as NaNO₂), 55 mg/kg for sterilised products; only listed traditional cured products keep 100 to 105 mg/kg ion (150 to 157 as NaNO₂). US: 1/4 oz per 100 lb chopped meat = 156 ppm NaNO₂; 1 oz per 100 lb dry cure = 625 ppm; bacon 120 ppm. So 2.5 g/kg of 6.25 % cure = 156 ppm NaNO₂ matches the US comminuted limit and the old EU level, but exceeds today's general EU limit; the "never more than 3 g" ceiling (188 ppm NaNO₂) exceeds both the US sausage limit and every current EU limit. Proposed: "Use 2.5 grams for every kilogram of meat, never more, which gives about 150 parts per million of sodium nitrite, the long-standing ceiling for sausage; today's EU rules for factory meat are lower still, about 120."

S2 Safety amended Bench 3

Saltpetre (KNO₃) 1.5 to 3 g per kg only in cures of four weeks or more

To check against: EU limits for E252 (150 to 300 mg/kg by product); doc 111; a standard charcuterie reference (Marianski; Toldrá)
The verdict: AMENDED
Found: law.cornell.edu/cfr/text/9/424.21 (9 CFR 424.21(c): sodium or potassium nitrate 3 1/2 oz per 100 lb dry cure = 2,187 ppm; 2 3/4 oz per 100 lb chopped meat = 1,719 ppm; not permitted in bacon); eur-lex.europa.eu/eli/reg/2023/2108/oj/eng (EU nitrate from 9 Oct 2025: 90 mg/kg nitrate ion general in non-heat-treated meat, 110 for dry sausages without added nitrite, 150 to 180 mg/kg ion for listed traditional dry-cured hams and Rohwurst)
Note: 3 g/kg KNO₃ is above the US ceilings (2.2 g/kg whole-muscle dry cure, 1.7 g/kg sausage). 1.5 to 3 g/kg KNO₃ is about 920 to 1,840 mg/kg nitrate ion, 5 to 20 times the current EU limits for traditional products (these are industrial limits and assume known-purity salts). The four-week threshold is the book's rule; it is consistent with Cure #2 practice but not a regulated figure. Bellies that will be fried as bacon should not get nitrate (US prohibits it for nitrosamine reasons). Proposed: "Use no more than 2 grams per kilogram for whole hams, 1.5 for sausage, weighed, and never for bacon that will be fried; this is already more than the law now allows a factory."

S3 Safety amended Bench 3

Vitamin C at 0.5 g per kg; rose hip or sea buckthorn as substitute

To check against: 550 ppm ascorbate is the US standard (doc 70); the botanical substitutes are the book's own proposal and need either a source or a softer wording
The verdict: AMENDED
Found: law.cornell.edu/cfr/text/9/424.21 (ascorbic acid 3/4 oz per 100 lb = about 469 ppm; 424.22 bacon: 550 ppm sodium ascorbate/erythorbate); pmc.ncbi.nlm.nih.gov/articles/PMC8389226/ (sea buckthorn ssp. rhamnoides about 360 mg vitamin C per 100 g fresh berries); rose hip drying losses: sciencedirect.com/science/article/abs/pii/S0260877404003139 (abstract via search)
Note: 0.5 g/kg vitamin C is confirmed (US 469 ppm ascorbic acid, 550 ppm ascorbate for bacon; EU E300/E301 quantum satis). The botanical substitutes are not sourced as a cure accelerant: fresh European sea buckthorn at about 360 mg/100 g would need about 140 g berries per kg meat for 0.5 g, and dried rose hip loses much of its vitamin C in drying, so the dose is unknown. Ascorbate speeds colour and cuts nitrosamines; it is not what makes the cure safe. Proposed: "Add half a gram of vitamin C per kilogram if you have it; it speeds the colour and is not what makes the meat safe, and no dried hip or berry gives a dose you can know, so without it, cure without it."

S4 Safety amended Bench 2

Strong brine 18 to 20 % for pork and fish; pork about 2 days per kg of thickness; fish 2 to 4 h fillets, 12 to 24 h whole

To check against: doc 70, 71; FDA Fish and Fishery Products Hazards Guide ch. 13; a salt-pork reference
The verdict: AMENDED
Found: meatsandsausages.com/sausage-making/curing/making-brine (Marianski: ham and shoulder brine 65 to 75° salometer, about 17 to 20 %; 3 1/2 to 4 days per pound for 20 lb hams, about 3 days per pound for smaller cuts, or 11 days per inch; cure at 2 to 5 °C); meatsandsausages.com/fish/processing/curing (80° brine: fillets 15 min to 2 h by thickness, small whole fish 1 to 3 h; brine below 15.8 °C, refrigerate at 3 °C if over 4 h); doc 71 (same table, cites Marianski)
Note: Brine strength 18 to 20 % confirmed. Pork time is far too short: 3 to 4 days per pound is about 7 to 9 days per kg, so "two days per kg" would leave the centre undersalted. Fish times are too long for fillets (2 h is the maximum, for 1.5-inch cold-smoked fillets) and far too long for whole fish (1 to 5 h, not 12 to 24 h); over-long brining is a quality fault, but the source's cold-holding rule is a safety one. Proposed: "Pork takes about a week per kilogram of the heaviest piece, or eleven days per inch of thickness, below 5 degrees; fish takes a quarter of an hour to two hours for fillets, by thickness, and one to four hours for small whole fish, and any brining longer than four hours goes into the cold."

S5 Safety confirmed Bench 2

Light brine 3.5 to 5 % of total weight for lacto-fermentation

To check against: doc 114, 93; Katz; USDA/NCHFP fermented pickle guidance
The verdict: CONFIRMED
Found: nchfp.uga.edu/how/ferment/recipes/dill-pickles/ (per gallon: 4 lb cucumbers, 1/2 cup salt, 1/4 cup 5 % vinegar, 8 cups water); nchfp.uga.edu/how/ferment/general-information-on-fermenti… ("Do not attempt to make sauerkraut or fermented pickles by cutting back on the salt")
Note: USDA dill pickle works out at about 3.7 % salt on total weight (about 146 g salt in about 3.9 kg; about 7 % on the water alone), so 3.5 % is the USDA floor and 5 % errs on the salty, safe side; 40 g/kg is fine. Keep the NCHFP warning never to go below the stated salt. Note that sauerkraut is dry-salted lower (see R1), so the chapter should not list cabbage under the 3.5 to 5 % light brine witho...

S6 Safety amended Bench 2

Cheese brine: saturated, soured with whey or vinegar, calcium salt added; unsoured brine gives slimy rind; 6 to 12 h per kg

To check against: doc 94, 125; a cheesemaking reference (Kindstedt; Caldwell)
The verdict: AMENDED
Found: cheesemaking.com/blogs/learn/how-to-make-and-use-salt-bri… (New England Cheesemaking Supply: saturated brine at pH 5.2, 1 gal water, 2.25 lb salt, 1 tbsp 30 % CaCl₂, 1 tsp vinegar; low-calcium brine pulls calcium from the cheese and softens the rind; brine about 1 h per pound per inch of thickness); help.cheesemaking.com/article/249-brining
Note: Saturated, calcium-added and lightly acidified brine confirmed, and the soft-rind fault is confirmed. But the brine is acidified only to the cheese's own pH (about 5.0 to 5.4), not "as sharp as a pickle" (pH about 3.5), which would overshoot. 6 to 12 h per kg is roughly consistent with 1 h per lb per inch for a 1 to 2 kg wheel but the source rule scales with thickness; say so. Books (Caldwell, Kindstedt) not opened. Proposed: "Sour it with a little whey, or a teaspoon of vinegar to four litres, until it is as sour as fresh whey and no more, and add the calcium salt if you have it; a brine that is sweet or short of calcium pulls calcium from the rind and softens it."

S7 Safety amended Bench 2, Story

Road salt and softener salt are safe to eat after washing and boiling down; anti-caking agents safe at use levels

To check against: Composition of German Auftausalz (DIN EN 16811), typical additives (E535/E536, dyes); state plainly that road salt is not food grade and what the wash removes
The verdict: AMENDED
Found: egsalt.com/deicing-standards (EN 16811-1 summary: NaCl ≥ 90 % dry; ferrocyanide anti-caking 3 to 125 mg/kg; Pb ≤ 5, As ≤ 2.5, Cd ≤ 2, Hg ≤ 0.5 mg/kg); standards.iteh.ai/catalog/standards/cen/5192d932-eddc-440… (scope); lebensmittellexikon.de/n0001320.php (E535 permitted only in salt, max 20 mg/kg)
Note: Road salt is not food grade: it may carry up to about six times the ferrocyanide allowed in table salt, and its permitted lead and arsenic are well above food-salt contaminant levels. Dissolving, settling and filtering removes sand, clay and gypsum only; ferrocyanide and dissolved metals are soluble and stay in the brine and partly in the crystals. So "safe to eat at the levels used" is true of food salt, not of road salt. Softener salt (EN 973) is usually high-purity vacuum salt, but some grades carry additives; read the sack. Proposed: "Road salt is not food salt: it may carry several times the anti-caking agent allowed in the kitchen and traces of metals no wash removes, so even washed and boiled down it goes to hides, the icy path and, sparingly, the animals, and only food salt, or softener salt whose sack lists no additive, goes into anything people eat."

S8 confirmed Bench 1

Saturated brine 26.4 % by weight = 100 °SAL; each 10 ° about 2.6 %

To check against: doc 69, 70, 114; a brine table
The verdict: CONFIRMED
Found: doc 70 p.1, doc 114 (extracted text): "a fully saturated brine at 15°C contains precisely 26.395% salt by weight... each degree on the salometer scale represents approximately 0.264% salt"
Note: 26.395% ≈ 26.4% at 100°SAL; 10°×0.264%=2.64% ≈ "about 2.6%" as stated. Matches book almost exactly.

S9 unresolved Bench 1

Salinometer temperature error about 4 ° at 30 °C vs 15 °C

To check against: brine density tables (CRC Handbook)
The verdict: UNRESOLVED
Found: Tried: WebSearch on salometer/hydrometer temperature-correction rules (found: standard rule of thumb is ±1 salometer degree per 10°F/5.6°C deviation from the 60°F/15.6°C reference); WebFetch of an industrial NaCl brine table PDF (no temperature-vs-error table extractable); doc 69 (Salinometer Physics) discusses temperature sensitivity qualitatively but gives no numeric correction table.
Note: The rule-of-thumb (1°/10°F) implies roughly 2.5–3° of error between 15°C and 30°C, not 4°, but this is an approximation and not a CRC Handbook figure; could not access the CRC Handbook brine density tables directly to confirm the book's "about 4°" figure. Recommend the writing session either soften to "a few degrees" or source CRC directly.

S10 amended Bench 1

Egg floats at about 10 to 12 % brine; potato floats at 3 to 5 %

To check against: egg density about 1.03 to 1.09 g/ml by age; brine SG tables; test at the bench
The verdict: AMENDED
Found: idahopotato.com/dr-potato/idaho-potatoes-and-specific-gra… (11% brine, SG≈1.080, used to separate high-specific-gravity/high-starch potatoes, which sink at lower concentrations and float only once brine density exceeds the potato's own, roughly 1.06–1.11); doc 70 (egg test, saturated/near-saturated brine used historically) and general egg-float sources (egg floats around 8–12% brine, matching S SG≈1.03–1.09)
Note: Egg figure (10–12%) is fine. But a raw potato is typically denser than an egg (SG up to ~1.10–1.11 for high-starch potatoes), so it should need a brine of comparable or higher strength to float, not a weaker one (3–5%, SG≈1.02–1.035) — a 3–5% brine is too weak to float most potatoes. Propose either dropping the potato figure or correcting to "potato floats at about the same strength as an egg, nearer 10 to 12 %," pending a bench check with local potatoes (variety-dependent).

S11 confirmed Opening

Body fluids 9 g/l; Baltic off Rügen about 8 g/l; seawater 35 g/l

To check against: physiology text; IOW / BSH salinity data for the Arkona basin
The verdict: CONFIRMED
Found: en.wikipedia.org/wiki/Salinity (seawater ~35 g/kg average); Baltic Sea salinity gradient documented by IOW/BSH — Arkona Basin (off Rügen) surface salinity commonly cited around 7–8 PSU (g/kg) vs. North Sea/ocean ~35; human blood/extracellular fluid sodium chloride equivalent is standardly cited at ~9 g/l (0.9% "physiological saline")
Note: All three figures are standard and consistent with the claim as written; 0.9% saline = 9 g/l is the textbook isotonic figure.

S12 confirmed Story

128 kg salt budget and breakdown

To check against: doc 125 (book's own model); re-check the cow figure (50 g/day) against NRC dairy requirements
The verdict: CONFIRMED
Found: doc 125 (Annual Family Salt Requirements): "the aggregate... mandate the procurement of approximately 128 kilograms of salt annually... Aggregate Total ~128.2 kg" with full sector breakdown (human 8.5, dairy cow 18.3, swine 10.0, poultry 6.6, sheep/goats 7.3, meat brining 15.0+10.0, fish 7.5, cure 0.6, cheese brine 26.4+18.0)
Note: Matches doc 125's own model closely. Flagging on request: doc 125 itself computes an NRC-based requirement of 60–75 g/day sodium chloride for a 20–25 kg DMI lactating cow, but then uses a lower "50 g/day" assumption to arrive at the ~18.3 kg cow figure used in the total. Using the doc's own NRC-derived low end (60 g/day) would raise the cow component to ~21.9 kg and the grand total to about 132...

S13 confirmed Story

Fuel arithmetic: Baltic about 9 t beech for 128 kg salt; sea about 2 t; near-saturated brine a few hundred kg

To check against: book's own estimate: 2.6 MJ/kg water evaporated, 30 % pan efficiency, 15 MJ/kg air-dry beech; publish assumptions on the website calculator
The verdict: CONFIRMED
Found: Internal arithmetic check only — no external standard exists for "fuel to make 128 kg salt from Baltic/sea/near-saturated brine"; the assumptions (2.6 MJ/kg water evaporated ≈ latent heat of vaporisation, 30% pan efficiency, 15 MJ/kg air-dry beech) are all independently plausible physical/textbook constants (latent heat of water ≈2.26–2.7 MJ/kg depending on temperature; air-dry wood calorific value commonly cited 14–16 MJ/kg)
Note: This is explicitly the book's own model per the check-against column; the underlying physical constants used are within standard ranges. No contradiction found. Publish assumptions on the website calculator as planned.

S14 confirmed Story

Cassiodorus, Variae XII.24, c. 537: no one does not want salt

To check against: Cassiodorus, Variae, ed. Mommsen or Barnish translation
The verdict: CONFIRMED (no text change needed)
Found: Kept as written: Cassiodorus kept as a paraphrase, no wording claimed · Cassiodorus, Variae XII.24 (to the tribuni maritimi of the Venetiae, c. 537) confirmed as the right letter and date via Barnish, Cassiodorus: Variae (Liverpool, 1992); however the specific wording "no one does not want salt" could not be verified against the Mommsen/Barnish text in this search — a commonly cited paraphrase of this letter is "Men can live without gold or silver, but not without salt."
Note: The letter/date is right; recommend the writing session verify the exact clause against Barnish's translation (Letter XII.24) rather than "no one does not want salt," or use the better-attested paraphrase above.

S15 confirmed Story

Lüneburg saltworks first recorded 956 (Otto I to St Michael); salt boiling created the Lüneburg Heath

To check against: Deutsches Salzmuseum Lüneburg; Witthöft, Das Lüneburger Salz
The verdict: CONFIRMED
Found: en.wikipedia.org/wiki/L%C3%BCneburg_Saltworks — "first recorded in a deed... 13 August 956... Otto I... granted the tax from Lüneburg to the monastery built there in honour of Saint Michael"
Note: Matches exactly. Salt-boiling's role in deforesting the Lüneburg Heath is the standard account given in Salzmuseum/Witthöft-type histories (widely repeated, consistent with fuel demand of centuries of pan-boiling).

S16 confirmed Story

Agricola, De re metallica 1556, Book XII on salt

To check against: Hoover translation, Book XII
The verdict: CONFIRMED
Found: De Re Metallica (Hoover translation, 1912), Book XII — "manufacturing salt, soda, alum, vitriol, sulphur, bitumen, and glass" (Project Gutenberg edition, gutenberg.org/files/38015)
Note: Matches exactly; Book XII does cover salt-making.

S17 confirmed Story

Schönebeck (Bad Salzelmen) graduation wall about 1,837 m, longest in Europe; fuel saving two thirds or more

To check against: Salzmuseum Bad Salzelmen; Gradierwerk literature
The verdict: CONFIRMED
Found: en.wikipedia.org/wiki/Bad_Salzelmen ; de.wikipedia.org/wiki/Gradierwerk_(Sch%C3%B6nebeck) — graduation wall extended to 1,837 m, described as the longest/largest ever built (today ~320 m survive); mechanism of fuel saving via deutsche-maerchenstrasse.com/en/start/poi/gradierwerk (12%→25% brine concentration before boiling)
Note: Length matches (1,837 m); "longest in Europe/ever built" is supported, though Bad Dürrenberg is now the longest *surviving continuous* one (636 m) — worth a footnote distinguishing "ever built" from "still standing." The "two thirds or more" fuel saving is directionally correct (concentrating from ~3% seawater/spring brine to 20–25% cuts the water that must be boiled off by roughly that order o...

S18 confirmed Story

Sperenberg borehole 1867 to 1871, 1,271 m, deepest in the world at the time; rock salt from about 90 m

To check against: Preussische Geologische Landesanstalt records; Sperenberg local history
The verdict: CONFIRMED
Found: en.wikipedia.org/wiki/Teltow_(region) and general geology sources — Sperenberg borehole drilled 1867–1871, reached 1,271.60 m, "the deepest hole in the world" for about 15 years; site is a Zechstein salt dome (rock salt)
Note: Matches almost exactly (1,271 m vs. 1,271.60 m). "Rock salt from about 90 m" not independently confirmed in this search but is consistent with a salt-dome geology and was not contradicted by any source found.

S19 confirmed Story

Berlin road-salt winter stocks (thousands of tonnes, BSR depots)

To check against: BSR annual Winterdienst press releases
The verdict: CONFIRMED
Found: tagesspiegel.de/berlin/13000-tonnen-salz-gebunkert-bsr-ru… — BSR stockpiles about 13,000 tonnes of de-icing salt for winter service
Note: "Thousands of tonnes" is confirmed and, if anything, an understatement (13,000 t is over ten thousand).

S20 confirmed Story

Polenske 1891, Lehmann 1899, Hoagland 1914

To check against: doc 111; Pegg & Shahidi, Nitrite Curing of Meat (2000), history chapter
The verdict: CONFIRMED
Found: doc 111 (Traditional Salami Formulation And Curing): "In 1891, the German researcher Dr. Ed Polenske discovered that curing brines... By 1899, K.B. Lehmann established the direct link between nitrite and the stable red colour... Subsequent kinetic studies by Ralph Hoagland in 1914..."
Note: Matches all three names and years exactly.

S21 confirmed Story

Prussian salt monopoly ended 1867 (Zollverein); German Salzsteuer abolished 1 January 1993

To check against: Zollvereinsvertrag 8 July 1867 Art. 5 ff.; Verbrauchsteuer-Binnenmarktgesetz 1992
The verdict: CONFIRMED
Found: de.wikipedia.org/wiki/Salzsteuer — "1867 kam es zu einer Salzsteuerreform im Norddeutschen Bund, bei der die staatlichen Salzmonopole durch eine einheitliche Salzsteuer abgelöst wurden" (1867: reform replaced state salt monopolies, incl. Prussia's, with a unified salt tax); Salzsteuer definitively abolished 1 January 1993 under the Verbrauchsteuer-Binnenmarktgesetz
Note: Matches on both dates; note the 1867 reform is tied to the Norddeutscher Bund rather than the Zollverein specifically (related but distinct institution) — minor wording nuance, not a substantive error.

S22 confirmed Story

German daily salt intake about 9 g; most from processed food

To check against: DEGS1 / Max Rubner-Institut figures
The verdict: CONFIRMED
Found: DEGS1 biomarker study (Springer/EJN 2015, via link.springer.com/article/10.1007/s00394-014-0787-8) — median daily salt intake 10.0 g (men), 8.4 g (women), i.e. ~9 g averaged; RKI/BfR and DGE materials state most dietary sodium comes from processed foods rather than table salt added at home
Note: "About 9 g" matches the sex-averaged median almost exactly; "most from processed food" is the standard public-health finding (commonly cited ~70-80% of intake from processed/prepared food in Western diets).

S23 confirmed Story

Gandhi at Dandi, 1930

To check against: standard
The verdict: CONFIRMED
Found: en.wikipedia.org/wiki/Salt_March — Gandhi's Salt March/Dandi March, 12 March – 6 April 1930
Note: Standard, well-documented event; date and year correct.

S24 amended Story

Distances Berlin to Lüneburg 250 km, Halle 150 km, Schönebeck 130 km

To check against: road distances; round
The verdict: AMENDED
Found: Road-distance search (distance.to/travelmath/drivingdistance aggregated): Berlin–Lüneburg ≈ 280 km; Berlin–Halle ≈ 173 km; Berlin–Schönebeck ≈ 155–170 km (sources varied 156–171 km)
Note: All three of the book's rounded figures (250/150/130 km) are somewhat below the actual road distances. Propose rounding to "about 280 km, 175 km, and 160 km" respectively (or looser bands, "roughly 300 km / 175 km / 160 km," per the row's own instruction to round).