fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-210 months ago[Partially incorrect, see comments.] Pens in Spacemander.xyzimagemessage-square148fedilinkarrow-up11.48K
arrow-up11.48Kimage[Partially incorrect, see comments.] Pens in Spacemander.xyzfossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-210 months agomessage-square148fedilink
minus-squarexor@lemmy.dbzer0.comlinkfedilinkEnglisharrow-up17·10 months agoit hasn’t been graphite for while now either….
minus-squareArcka@midwest.sociallinkfedilinkEnglisharrow-up5·10 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}
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