Cadmium-Barium Orange, a version of cadmium orange that is less expensive to make. When a paint is marked PO20:1 (as opposed to just PO20) the PO20:1 version may contain significantly higher amounts of barium sulfate.
The same health warnings apply as Cadmium Orange (see PO20).
Copied from PO20: Debate has raged around the toxicity of 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. Here's a source, another source and another source. 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 Selenium and Barium. 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.
PO20:1 is a cheaper way of making cadmium orange which has less strength.
