Inorganic pigments are produced from either naturally mined pigments (sienna, umber, ochre) or synthetically manufactured pigments, (iron oxide, carbon black, etc). Inorganic pigments may also be produced using a combination of these two processes. Inorganic Pigments that are both mined and manufactured include the Cadmiums, Cobalts, and Titaniums.
The organic pigments are a group of colourants synthetically produced through complex carbon-containing chemistry involving various materials including petroleum, coal tar and natural gas. Many of these pigments have their roots in the chemistry of the 1800s, although widespread production didn't really begin until the 1930s. Even though they have only been available for several decades, organic pigments have demonstrated remarkable abilities to withstand the impact of light and weather.
Dye-based inks tend to be cheaper and water soluble. So what's the advantage of dye ink? Colour vibrancy. Colours are brighter because various optical compounds are added to dye inks to enhance the colours. Fading can be an issue if exposed to the sun; these compounds have a low resistance to light or to UV-rays. While dye ink has its drawbacks, advances in ink development have improved the fade resistance of dye inks. I would recommend checking the brands lightfast.
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