@[email protected]M to Science [email protected]English • edit-23 months ago[Partially incorrect, see comments.] Pens in Spacemander.xyzimagemessage-square148fedilinkarrow-up11.47K
arrow-up11.47Kimage[Partially incorrect, see comments.] Pens in Spacemander.xyz@[email protected]M to Science [email protected]English • edit-23 months agomessage-square148fedilink
minus-square@[email protected]linkfedilinkEnglish5•3 months agoRegular chalk is calcium carbonate. Crayola’s website says their sidewalk chalk uses calcium sulfate (gypsum as an ingredient in plaster of paris). So they’re both calcium salts.
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Chalk isn’t chalk?
Regular chalk is calcium carbonate. Crayola’s website says their sidewalk chalk uses calcium sulfate (gypsum as an ingredient in plaster of paris).
So they’re both calcium salts.
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