fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-22 months ago[Partially incorrect, see comments.] Pens in Spacemander.xyzimagemessage-square143fedilinkarrow-up11.44Karrow-down132
arrow-up11.41Karrow-down1image[Partially incorrect, see comments.] Pens in Spacemander.xyzfossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-22 months agomessage-square143fedilink
minus-squareArcka@midwest.sociallinkfedilinkEnglisharrow-up5·2 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.
![[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