fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-25 days ago[Partially incorrect, see comments.] Pens in Spacemander.xyzexternal-linkmessage-square151fedilinkarrow-up11.46Karrow-down135
arrow-up11.42Karrow-down1external-link[Partially incorrect, see comments.] Pens in Spacemander.xyzfossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-25 days agomessage-square151fedilink
minus-squarexor@lemmy.dbzer0.comlinkfedilinkEnglisharrow-up18arrow-down2·4 days agoit hasn’t been graphite for while now either….
minus-squareArcka@midwest.sociallinkfedilinkEnglisharrow-up5·4 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}
it hasn’t been graphite for while now either….
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