Copying pencil Copying pencil A copying pencil, also indelible pencil or chemical pencil, is pencil whose lead contains a dye. The lead is fabricated by adding a dry water-soluble permanent dye to powdered graphite—used in standard graphite pencils—before binding the mixture with clay. Copying pencils were introduced in the 1870s and were originally marketed for copying documents, especially for making permanent copies of a permanent original. This was achieved by creating a hand-written document using a copying pencil, laying a moist tissue paper over the document and pressing down with a mechanical press. The water-soluble dye in the writing would be transferred
Lead abatement in the United States reductions in crime, and more. The immense costs of inaction make lead hazard control highly economical. This is even more true in for the "lowest hanging fruit", like removing lead from all fuels including in lower income countries. The United Nations and the World Health Organization have been leading efforts to eliminate lead in paint since 2002. Lead abatement in the United States Lead abatement is an activity to reduce levels of lead, particularly in the home environment, generally to permanently eliminate lead-based paint hazards, in order to reduce or eliminate incidents of lead poisoning. Lead abatement may be undertaken