Digital BW, The Print

Joost Horsten wrote:
> --- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Louis Dina" 
> <lou@...> wrote:
>> Joost,
>>
>> I have both the Breathing Color Glamour II and Clearshield Type C
>> laminate in gallon buckets.  Neither product lists any ingredients on
>> the label.  
> 
>> Both the
>> products I are water based and are probably acrylic based, but that is
>> just a guess.  
> 
> Indeed I got the same info from the website of Breathing Color Glamour. 
> How does it look like when wet? Opaque white? That could point to 
> acrylics. Acrylics have also a rather distinct smell, a bit difficult 
> to describe, clearly "synthetic" but not too stroong, with a bit of a 
> sweet undertone.  Does this poor description ring a bell?

Any clear varnish dispersion with water will look white 
(same reason milk does), not opaque white though.
So a clear (aliphatic) urethane dispersion will look similar 
in color. I have a UV curing version of the last and it is 
white in the can. Can't be used for absorbent inkjet papers 
though.

Quite often copolymers are used so acrylic doesn't tell all, 
in silkscreen printing you will find acrylic dispersions 
with (butyrate) styrene components added. Cheaper but more 
prone to yellowing. Acryl + urethane isn't uncommon either.

Ethyl acetate but Amyl acetate even more have a sweet smell. 
Used as sweeteners in food and both are mild solvents for 
acrylics. Chloroform is a better solvent for acrylic but not 
recommended :-)


-- 
Met vriendelijke groeten,  Ernst


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