Pencil thereby pushing a new tip to the top. Invented by Harold Grossman for Empire Pencil Company in 1967 and subsequently improved upon by Arthur D. Little for Empire from 1969 through the early 1970s; the plastic pencil was commercialised by Empire as the "EPCON" Pencil. These pencils were co-extruded, extruding a plasticised graphite mix within a wood-composite core. Residual graphite from a pencil stick is not poisonous, and graphite is harmless if consumed. Although lead has not been used for writing since antiquity, lead poisoning from pencils was not uncommon. Until the middle of the 20th century the paint used
Lead Pencil Studio that "...The billboard promises, 'Your Own Piece of Blue Sky!' The wall text tells us the artists are exploring the complex systems involved in the production of space. In other words, advertising dominates the view." Lead Pencil Studio Lead Pencil Studio is the working name of the art and architecture collaborative founded in 1997 by Annie Han and Daniel Mihalyo in order to cooperatively pursue installation art, site-specific art and functional architecture. They are winners of the 2007 Founder's Rome Prize in Architecture from the American Academy in Rome, and were recognized in 2006 as an 'Emerging Voices' by the