Cadmium Lithopone Yellow. A slightly cheaper form of cadmium yellow pigment with diminished tinting strength. There are two forms of the pigment, and the higher quality Cadmium Yellow is PY35, while that which has 15% or more barium sulfate is supposed to be labeled PY35:1. We were interested to learn that sometimes more means quite a bit more than 15%.
Unfortunately, sometimes paintmakers will sell PY35:1 under the pigment code PY35.
Though the chroma is sometimes oddly diminished in PY35:1 and it doesn't have the same tinting strength, much of the general information on PY35 applies to this color. For example, both are affected by moisture when tested in direct sunlight but otherwise have high lightfastness.
Copied from the entry for PY35 on health: Debate has raged around the cadmiums, and they are listed as pigments with toxicity, so be extremely cautious with them. Lately we have seen a lot of resources suggesting the modern cadmium pigments are engineered to be far less toxic source, another source and another source, compared with regular cadmium. However, we always err on the side of caution with pigments (there is no downside to being super careful) and so we always handle these with respect. Also beware with older cadmiums for many reasons as they may also contain toxic adulterants like lead. We have read not to breathe them (this means not using them for airbrush). However, we are not experts in health and safety so please consult the relevant authorities on their proper handling and disposal. According to the work of Monona Rossol, cadmium is a carcinogen and causes kidney damage. The Artist's Guide to Health and Safety has more information about the hazards of pigments containing Cadmium as well as Barium, as well as information on Sulfides. They should not be sprayed and the dust should be stringently avoided (remember in regard to avoiding sanding). It should go without saying, but absolutely do not ingest any pigment.
These are fairly lean oil paints as far as the oil required.
Cadmium Yellow actually has two pigment codes, PY35 and PY37. PY35 tends to be for cooler yellows though has quite a range, while PY37 makes warmer yellows. PY35:1 and PY37:1 are cheaper ways of making cadmium yellow which have less strength.
