Graphite is used in pencils because of its ability to leave gray marks on paper. It was originally thought to be a form of lead.Continue Reading
In spite of the name, lead pencils do not actually contain lead. During the Roman Empire, lead rods were used for writing on papyrus. In the 16th century, a large deposit of graphite was discovered in England; shortly after this discovery, graphite became a common material used for writing. It was originally thought to be a darker form of lead and was therefore given the name "Blacklead" or "plumbagoi."
In the late 1700s, a Swedish chemist determined that graphite was a form of carbon rather than lead. The name of the substance was soon changed to graphite, after the Greek word for "to write."
Ink was commonly used for writing — applied using a device called a "peniculus" — from which the word "pencil" is derived. Early forms of pencils involved a graphite rod wrapped in string and inserted into hollow sticks. Eventually a mixture of graphite and clay was developed that eliminated the need for string and produced a harder substance that could easily be inserted into hollow rods. Altering the ratio of graphite to clay produces variations in the darkness of the markings made by the pencil. Adding other materials such as dye, wax, water or charcoal can produce pencils used for other purposes, including cosmetics and art.Learn more about Atoms & Molecules
Items that teachers should include on teacher supply lists include paper, pencils, sticky notes, ink pens, staplers, record books and file folders. Elementary teachers should also include crayons, glue, rounded scissors, watercolor paints and counting blocks. Highlighters, college-ruled paper and graphing calculators are also beneficial supplies to include for teachers of middle or high school students.Full Answer >
Zentangle kits come with pens, pencils and paper that artists use to create structured and repetitive patterns. While Zentangle patterns follow rules, artists transcend structure and shift their perspective to come up with unique drawings that are intuitive and creative. The Zentangle method reportedly fosters relaxation and inspiration, and some people use it to focus their creative energy in a daily ritual. However, some users report that Zentangle is simply glorified doodling and that the kits are too expensive.Full Answer >
Some supplies a middle schooler may need for a locker include traditional school supplies like a backpack, pens, notebooks, binders, pencils and paper, in addition to the lock used to secure the locker. Shelves, mirrors, hanging hooks and a magnetic organizer can be helpful for keeping the locker's supplies organized, suggests Container Store.Full Answer >
As of 2016, office supplies listed on the Dollar Tree website include pens, pencils, markers, paper and notebooks. Additional items include reading books, electronics, first aid, sanitizers and religious supplies. Actual items may vary among stores, and the company website has a store locator with store contacts.Full Answer >