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  #21  
Old 10-12-06, 01:46 AM
Alessandra Kelley Alessandra Kelley is offline
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Sabine:

Over the last fifty years acrylics have been increasingly used in art and design, but it has also become increasingly clear that they deteriorate in unpleasant and irreversible ways. For example, acrylic furniture, and even astronauts' space suits, are crumbling and fogging. Acrylic paints are already known to have numerous structural problems (see links below), and it seems likely that they will also show ageing troubles.

Links:
http://palimpsest.stanford.edu/byfor...2005/1319.html
http://palimpsest.stanford.edu/byfor...2002/1361.html
http://www.si.edu/MCI/english/learn_...paintings.html
http://www.tate.org.uk/research/tate...dernpaints.htm

General info on plastic degradation:
http://www.discover.com/issues/dec-0...featchemistry/
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  #22  
Old 10-12-06, 10:21 AM
sabine sabine is offline
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Thank you very much for these informations :-)
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  #23  
Old 10-12-06, 03:47 PM
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Salamander Salamander is offline
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Great information, Thanks,
Eric in Oceanside
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  #24  
Old 10-12-06, 08:36 PM
dbclemons dbclemons is offline
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Quote:
Originally Posted by eggart
dbclemons I wondered if you would mind telling me the process for casein gesso panels? Thanks.
I's basically much the same as a hide glue recipe, but I make it a bit stronger (less diluted.)
http://www.sinopia.com/casein.html
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  #25  
Old 18-12-06, 01:13 PM
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jeff jeff is offline
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There is no reason not to paint onto watercolour paper. I have tried it glued to a board and also free without problems. It isn't as good as gesso though. Another easy sort of ground to make is just using rabbit skin glue to attach calico (light cotton) to a board. It doesn't really need any other treatment if you don't want too. The presence of a weave can produce very nice effects in egg tempera so it shouldn't be frowned upon. I remember seeing in a book on Egyptian mummy portraits an example of egg tempera painted on loose cloth that had survived quite well for 1800 years too.
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  #26  
Old 18-12-06, 04:47 PM
sabine sabine is offline
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jeff, you paint on simple, unprepared aquarel paper? or do you glue it first?

I'm thinking of trying other kinds of supports too!
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  #27  
Old 19-12-06, 02:45 AM
Alessandra Kelley Alessandra Kelley is offline
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Most of Ben Shahn's tempera paintings are on paper. I would put on a sizing of rabbitskin glue.
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  #28  
Old 19-12-06, 05:08 PM
sabine sabine is offline
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OK that would have been too easy :grin:
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  #29  
Old 20-12-06, 01:02 PM
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I don't really use watercolour papers much but I don't size them. They should be sized in most cases anyway. I have back painted egg tempera onto glass as well and it is quite interesting to try. It is really throwing away most of the unique properties of egg tempera though because it creates a powerful graphic effect.
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  #30  
Old 20-12-06, 03:38 PM
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Salamander Salamander is offline
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I'm wondering about using methylcellulose (CMC) gum and whiting or zinc or titanium diox, or any other combination as a primer/sealer/ground for paper under et.
A version of this is sometimes sold as silverpoint ground.
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