Comparing E170I - Calcium carbonate vs E538 - Calcium ferrocyanide
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Popular questions
What is chalk made of?
Traditional chalk is mostly calcium carbonate (CaCO3), a naturally occurring mineral; some modern blackboard “chalk” sticks may instead use calcium sulfate (gypsum).
What is chalk paint?
It’s a matte decorative paint that uses calcium carbonate as a white pigment/filler to create a chalky, velvety finish with good coverage and adhesion.
How to make chalk paint?
Stir calcium carbonate powder into a little water to make a slurry, then mix it into latex/acrylic paint—about 2–3 tablespoons calcium carbonate per 1 cup of paint—adjusting to reach the desired texture and coverage.
Can you eat chalk?
Food‑grade calcium carbonate (E170i) used in foods and supplements is considered safe at permitted levels, but eating non‑food‑grade chalk sticks isn’t advised and excessive intake can cause constipation or high‑calcium effects.
What is calcium carbonate used for?
In foods, E170i is used mainly as a white colorant and stabilizer and as a source of calcium; beyond food, it’s common in antacids and as a filler/pigment in tablets, paints, paper, and plastics.
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.