Green pigment

Phthalocyanine green is a blue molecule turned green. It starts as copper phthalocyanine, the flat ring molecule behind phthalo blue, and has the hydrogen atoms around its rim replaced with heavier halogen atoms.

To make it, the blue is stirred into a hot molten salt mixture and treated with chlorine gas, bromine or both. One by one, the 16 hydrogen atoms on the outer rings are swapped for halogens. The more are swapped, and the more of them are bromine, the further the color shifts from blue-green toward yellow-green. Pigment Green 7 is mostly chlorine; Pigment Green 36 adds a lot of bromine. The product is washed and milled into fine particles.

It appears twice in a TV. In the color filter, it colors the green subpixels, usually blended with a yellow pigment to sharpen the color. Many recent filters use a zinc-centered relative, Pigment Green 58, which lets more light through, but the idea is the same. On printed circuit boards, it gives solder mask its familiar green.

Like the blue, it's extremely stable: it doesn't fade in sunlight and survives the baking steps used to make filters and boards.