Are you looking into making your own watercolors? Here are some of my favorite pigment suppliers, as well as instructions on binder recipes.
JUST PIGMENTS (shimmer and chameleon pigments)
PAINT WITH PEARL (chameleon, holo pigments)
MASTER PIGMENTS (natural pigments such as Malachite, Cinnabar etc)
WATERCOLOR PAINT MAKING TOOLS, USA:
HOW TO MAKE WATERCOLOR PAINT:
HOW OCRE PIGMENTS ARE BEING FORAGED/PROCESSED: