The Coast Guard requires boats to have at least one B-1 marine fire extinguisher on board. Depending on the size of your boat you may need more than one. Boats less than 26' have to have at least one B-1 fire extinguisher on board.
Graphite is a mineral composed exclusively of the element carbon. Graphite has the same chemical composition as Diamond, which is also pure carbon, but the molecular structure of Graphite and Diamond is entirely different.This causes almost opposite characteristics in their physical properties. Graphite is rather common mineral, but fine crystals are rare.Most Graphite mining areas produce enormous quantities from a single or several large Graphite vein s, but collector specimens in good crystals are not commonly encountered. Rare hexagonal polymorph of Graphite and Diamond formed only in a meteoric environment where extreme heat and pressure caused it to form. To date, it is only found in Mottigen, Ries Crater, in Bavaria, Germany. As it differs in crystal structure, Chaoite is scientifically categorized as an individual mineral species.
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.