U of S | Mailing List Archive | alt-photo-process-l | Re: alizarin crimson and lightfastness

Re: alizarin crimson and lightfastness

Don't trust manufacturer's ratings on lightfastness; they are often not, well, trustworthy. If it's PR83, you can be sure it's not permanent, regardless of the manufacturer's rating.

On Aug 8, 2008, at 8:36 AM, Laura Valentino wrote:

I read on the Handprint website that alizarin crimson PR 83 has a very low lightfastness rating, but the label on my tube of Sennelier Aquarelle brand gives it an ASTM rating of 1. What gives?

Best Regards,