Comparing E538 - Calcium ferrocyanide vs E539 - sodium thiosulfate
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Popular questions
Why is sodium ferrocyanide kosher and calcium silicate is not?
Ferrocyanides—including calcium ferrocyanide (E538)—are synthetic inorganic salts with no animal-derived inputs, so many certifiers accept them as inherently kosher, while some calcium silicate products may require certification due to potential non-kosher processing aids, carriers, or shared equipment. Policies vary by certifier and manufacturer, so the status reflects production controls rather than an inherent kashrut issue with the chemical itself.
What is sodium thiosulfate used for?
As a food additive (E539), it functions as an antioxidant and sequestrant, binding trace metals and helping prevent oxidation; it’s also used to neutralize residual chlorine in processing water.
How much sodium thiosulfate to neutralize chlorine?
About 7 parts of sodium thiosulfate pentahydrate (Na2S2O3·5H2O) are needed per 1 part of chlorine (as Cl2) by weight—for example, ~7 mg/L thiosulfate per 1 mg/L free chlorine; in practice, a small excess is often used.
Is gold sodium thiosulfate in makeup?
Gold sodium thiosulfate is a different compound from food additive E539 and isn’t typically used in cosmetics; check the ingredient list if you’re concerned about gold-containing ingredients.
How many elements are in sodium thiosulfate?
Anhydrous sodium thiosulfate (Na2S2O3) contains 3 elements (Na, S, O); the common pentahydrate (Na2S2O3·5H2O) includes 4 (adds H from the water of crystallization).
What does sodium thiosulfate do?
In foods it acts as an antioxidant and sequestrant, helping prevent oxidation and off-colors by binding metals, and it can dechlorinate processing water.