The coal industry of Maverick County is located along a section of the Olmos Coal Formation immediately north of Eagle Pass. Mining operations developed by Dolch at Dolchburg and by the Olmos Coal, Coke, and Oil Company at Olmos were the largest coal producers in Texas around the turn of the 20th century.
Those photos still fade over time, plastic doesn't prevent the materials from fading or deteriorating. Pencil that's the old lead pencils, or the new graphite pencils will not fade. Graphite is the most stable form of carbon. It's color is grey rather than black, so the line will be lighter than a black color pencil, but they are not susceptible to fading, they are extremely stable.
As mentioned on our The Unleaded Pencil page there is no lead in the writing core of a âleadâ pencil. The core is made of non-toxic graphite and does not contain lead.As a result of increased concern for the safety of different consumer products such as toys or art products from China, we often receive inquiries regarding the potential for exposure to lead in pencils.he only relevant concern regarding potential sources of lead in pencils is in the lacquer or paint used to finish the pencil. First, lead is a naturally occurring element that is contained in many different raw materials used in many industries to produce many consumer products.