Jun 3
5 min read
Has Graphene found some lead for its pencil?
Concrete and batteries?
Photo by Ramakant Sharda on Unsplash
Lead pencils, the ones we used to find in school with HB embossed on the side in a typical classroom, or 2B, 3B and so on, if you did an art class, defined a hardness scale. The softer the lead, the bigger the B and the darker the marks made.
