fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-29 个月前[Partially incorrect, see comments.] Pens in Spacemander.xyzimagemessage-square147linkfedilinkarrow-up11.48Karrow-down134
arrow-up11.45Karrow-down1image[Partially incorrect, see comments.] Pens in Spacemander.xyzfossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-29 个月前message-square147linkfedilink
minus-squarexor@lemmy.dbzer0.comlinkfedilinkEnglisharrow-up18arrow-down2·edit-27 个月前deleted by creator
minus-squareArcka@midwest.sociallinkfedilinkEnglisharrow-up5·9 个月前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.
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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.
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