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actonern Super Member
Joined: 15 Aug 2007 Posts: 444
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Posted: Mon Jan 07, 2008 11:20 am Post subject: bitumen/asphaltum continued |
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Since I had indifferent results attempting to dissolve road tar in turpentine (it would never achieve a honey like consistency) I kept looking...
I bought a tin of "Senefelder's liquid Asphaltum" at an art supply store. It has a "honey like consistency" but I don't know anything about the contents to use it with confidence yet.
Are any of you familiar with this product? |
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MANFIO Super Member
Joined: 11 Apr 2007 Posts: 458 Location: Sao Paulo
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actonern Super Member
Joined: 15 Aug 2007 Posts: 444
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Posted: Mon Jan 07, 2008 8:17 pm Post subject: |
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thanks again, Manfio...
I have googled to no avail to find out if there is any evidence that the Cremonese makers used bitumen in their varnishes?
Any thoughts? |
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DonLeister Moderator
Joined: 29 Mar 2007 Posts: 383 Location: Richmond, VA
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Posted: Mon Jan 07, 2008 11:53 pm Post subject: |
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Actonern,
I found some tar in the alley behind a shopping center where it splashed off the roof being recoated. I think Michael D, suggested roofing tar, the kind that comes in a big chunk to be melted and put on roofs.
But then, I have not tried road tar either. Maybe it is just the thing
You can search one of the other forums (say, Maestronet for instance) for more about it. I doubt any one will say it was definitely authentic Cremonese (even Michael), but instead more of a useful colorant when combined with other pigments then put into varnish. |
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MANFIO Super Member
Joined: 11 Apr 2007 Posts: 458 Location: Sao Paulo
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Posted: Tue Jan 08, 2008 10:50 am Post subject: |
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Bitumen is good to take off the excessive brightness of colours such as red or orange, but it has an interesting colour by itself. Michael Darnton mentioned roof tar.
I think there is no evidence of it's use the Cremonese, but chemical analise of Cremonese varnishes is not all that perfect. If I'm not wrong, a research in Germany pointed out to charcoal in Strad's varnish. _________________ www.manfio.com
http://www.flickr.com/photos/7875988@N02/with/464604020/ |
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