| http://www.w3.org/ns/prov#value | - It may also be desirable, for certain applications, to add 0.001% to 20% by weight of an inert filler, such as calcium carbonate, talc, china clay, to the composition, providing that the filler does not substantially interfere with the absorption and emission of light by the phosphorescent pigment and fluorescent dye for the desired application.
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