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A substance added to something in small quantities to improve or preserve it.

A compound containing a ligand (typically organic) bonded to a central metal atom at two or more points.

A pigment is a material that changes the color of reflected or transmitted light as the result of wavelength-selective absorption. This physical process differs from fluorescence, phosphorescence, and other forms of luminescence, in which a material emits light.

When identical simple molecules (monomers) come together and link up in a chain-like fashion, they form a polymer. The chemical reaction that forms a polymer is called polymerization. There are natural polymers (often referred to as biopolymers), such as cellulose, rubber and DNA, and synthetic polymers, such as polyethylene, nylon and PVC. Most resins are polymers.

A hard, unreactive, colorless compound that occurs as the mineral quartz and as a principal constituent of sandstone and other rocks.