Re: My own PVA glue sizing experience (attn: marek + the gum woesagain)

[phritz phantom <phritz-phantom@web.de>]

hi loris,
while it probably is a lot of pigment, i've been doing my test for stain 
with the same pigment and ratio.
it was almost always 5ml gum + 5ml pot-di sat. + 1gr of iron oxide black 
powder.
and this is how it printed last week: same mix, same size, same paper 
(i've already posted it), even the same exposure time.
http://i31.photobucket.com/albums/c367/phritz/1-1.jpg
there is definitely something else going on, that i just can't put my 
finger on.

and i don't usually keep my mixed solutions for longer, but i coated the 
first test strip yesterday and kept the rest for a little later. then 
something else came up and all was delayed until the next day. i've kept 
mixed solutions for a few days (stored in the dark) before and while 
there might be small differences in behaviour (i never really checked 
with a step wedge), they usually print more or less fine.

it's good to hear that your pva works better than the caparol. so there 
is hope with the substance.

regards
phritz







Loris Medici schrieb:
> 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.
>
>