Re: alizarin crimson and lightfastness

[Katharine Thayer <kthayer@pacifier.com>]

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.
Katharine



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,
> Laura