I have found a reliable supplier for at least some inorganic materials from a U.S. supplier I have not seen mentioned here. I have been getting
Yttrium oxide from US Pigment Corporation (https://uspigment.com) that has been of good qualiuty for pigment making. They carry a variety of inorganic materials useful in ceramics (metal
oxides and carbonates; some nitrates chorides, sulfates, sulfides, dichromates), as well as rare earth oxides. There are some uncommon and toxic
materials, including a thing or two I have not seen elsewhere (one of them useful for making mid-19th century green pigments among them) so please be
careful and use them responsibly.
I should probably also mention that I have also had good experience with materials from Seattle Pottery Supply, though what they carry is far more
limited and less exotic. But it is local for me. See https://seattlepotterysupply.com/pages/raw-materials chloric1 - 1-12-2024 at 18:53
Yeah us pigment rules. I only live like 214 miles away since it’s in the northwest suburbs of Chicago. I purchased significant quantities of
sodium dichromate and potassium permanganate on the cheap. The dichromate was $6 per pound! Obviously will be starting point of ALL chromium
chemistry. Some compounds from there are great for lab work right out the gate. Others do require some work to purify for lab use but generally
worth it for cost savings RogueRose - 9-12-2024 at 17:27
