@fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish • edit-229 days ago[Partially incorrect, see comments.] Pens in Spacemander.xyzimagemessage-square151fedilinkarrow-up11.46K
arrow-up11.46Kimage[Partially incorrect, see comments.] Pens in Spacemander.xyz@fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish • edit-229 days agomessage-square151fedilink
minus-square@Arcka@midwest.sociallinkfedilinkEnglish5•29 days 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.
![[Partially incorrect, see comments.] Pens in Space](https://mander.xyz/pictrs/image/466a2af6-4d33-4f93-aa6c-eaaf49ab899f.jpeg){kind=link}
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.
no