With moderate lightfastness, best to do some research if this pigment is part of your workflow. The pigment code may be listed as PO43(DL), which connotes that it may darken in strong light.
Only one major manufacturer uses Perinone Orange as single-pigment paint in oils, however five other paintmakers have used it in a long list of blends. Lightfastness can dip to a five on the blue wool scale in some cases, so best to do one's own tests. Please take extra caution if working with its in a dust form -- consult Monona Rossol's work for more. This may be relevant to keep in mind as this pigment is sometimes used for pastels.
