Re: My own PVA glue sizing experience (attn: marek + the gum woesagain)
I agree with Loris...
I've found that black and blues in general can stain more easily, and especially when they are too concentrated. For example, when printing with Ivory Black, I got staining at 1 gram pigment / 2 ml gum, but it worked perfectly when increasing the gum to 4 ml.
All pigment brands are different, I am told, so you'll have to find the sweet spot for you.
----- Original Message ----- From: "Loris Medici" <email@example.com>
Sent: Friday, October 23, 2009 11:39 AM
Subject: Re: My own PVA glue sizing experience (attn: marek + the gum woesagain)
Hi Phritz, I checked again with a wet hard bristle brush and no gum was lifted until I finally physically damaged the surface. (I brushed very long time and very hard.) Conclusion, my version of PVAc glue size is perfectly fine in that sense. Very tough, very durable and keeps the exposed/developed layer onto itself. BTW, it's not a good idea to keep the coating solution (gum/pigment + dichromate) for a day. You'll get "dark effect". Just mix enough for immediate use. I'll repeat that your coating solutions seems to be very high in pigment load; that's definitely not a coating solution to expose/develop in the normal way, to my eyes. I'd use that much pigment only if I plan bleach development... Regards, Loris. 2009/10/23 phritz phantom <firstname.lastname@example.org>:hi loris,