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Merck manufactured pearlescent pastels sold by Sennelier and Guache watercolors sold by Schmincke. I was provided samples of these a number of years ago and found them attractive but not otherwise useful to the kind of work that I like to produce. They might be good for special effects. I used them for vinyl flooring patterns and they are now every where including your tooth paste.
Most of the metallic and pearlescent pigments in the marketplace today are made from a form of the mineral mica or produced from an extrusion process. They were first made prominent by automobile manufacturers to achieve metallic effects without using unstable and environmentaly unsafe metals. They also provide irredescent colors that will make colors look different as the light and direction you abserve them changes.
I could not find names of others that I know provide these "pigments" in dry form but do recall that Engelhard Corp is among those and you can get info from Sunny Maffeo, 732-205-7365.
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