fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-26 个月前[Partially incorrect, see comments.] Pens in Spacemander.xyzimagemessage-square150linkfedilinkarrow-up11.47Karrow-down134
arrow-up11.43Karrow-down1image[Partially incorrect, see comments.] Pens in Spacemander.xyzfossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · edit-26 个月前message-square150linkfedilink
minus-squareNuraShiny [any]@hexbear.netlinkfedilinkEnglisharrow-up8arrow-down2·6 个月前There is no way either side used lead pencils. Saying lead is in pencils is a very outdated thing, it’s all graphite these days.
minus-squarexor@lemmy.dbzer0.comlinkfedilinkEnglisharrow-up18arrow-down2·6 个月前it hasn’t been graphite for while now either….
minus-squareArcka@midwest.sociallinkfedilinkEnglisharrow-up5·6 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.
minus-squareAndromxda 🇺🇦🇵🇸🇹🇼@lemmy.dbzer0.comlinkfedilinkEnglisharrow-up4·edit-26 个月前A sharp piece of graphite from a broken pencil is not something you would want in your eyes either
![[Partially incorrect, see comments.] Pens in Space](https://mander.xyz/pictrs/image/466a2af6-4d33-4f93-aa6c-eaaf49ab899f.jpeg){kind=link}
There is no way either side used lead pencils. Saying lead is in pencils is a very outdated thing, it’s all graphite these days.
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
A sharp piece of graphite from a broken pencil is not something you would want in your eyes either