fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-213 days ago[Partially incorrect, see comments.] Pens in Spacemander.xyzexternal-linkmessage-square140fedilinkarrow-up11arrow-down10
arrow-up11arrow-down1external-link[Partially incorrect, see comments.] Pens in Spacemander.xyzfossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-213 days agomessage-square140fedilink
minus-squarexor@lemmy.dbzer0.comlinkfedilinkEnglisharrow-up0·13 days agoit hasn’t been graphite for while now either….
minus-squareArcka@midwest.sociallinkfedilinkEnglisharrow-up0·13 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.
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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.