Re: alizarin crimson and lightfastness

[Laura Valentino <laura@this.is>]

That could be, but then none of their paints would rate very high :)

So, the rating on the back is the manufacturer's own rating...hum...

Laura


Katharine Thayer wrote:
> P.S.  Are you sure Sennelier isn't using a rating system where 1 is the 
> worst?  :--)
> kt
>
>
>
> On Aug 8, 2008, at 9:03 AM, Katharine Thayer wrote:
>
> > 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