fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-21 year ago[Partially incorrect, see comments.] Pens in Spacemander.xyzimagemessage-square150fedilinkarrow-up11.49Karrow-down134
arrow-up11.45Karrow-down1image[Partially incorrect, see comments.] Pens in Spacemander.xyzfossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-21 year agomessage-square150fedilink
minus-squarexor@lemmy.dbzer0.comlinkfedilinkEnglisharrow-up18arrow-down2·1 year agoit hasn’t been graphite for while now either….
minus-squareArcka@midwest.sociallinkfedilinkEnglisharrow-up5·1 year 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.
no