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tea question for Manfeo (or anyone ? )

 
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jethro
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Joined: 07 Apr 2007
Posts: 178

PostPosted: Sat Oct 27, 2007 2:03 am    Post subject: tea question for Manfeo (or anyone ? ) Reply with quote

I made some STRONG tea solution (2 family size bags in about 1/4 cup
water) , came out fairly dark and "glossy" looking. Since I had not
sealed my naked top yet I decided to add into the hot tea about a tablespoon of medium hyde glue solution. I poured in the glue ----
and BOOOMMMM the solution appeared to percipitate --- creating a
bright milkey white percipitate. The percipitate seemed to spread out
and resulted in a kind of "coffee with heavt cream" look . I guess
either the glue or the tea dropped out of solution but I don't know which.
I used it on the naked top. I put it on very gradualy with a barely damp
sponge held in forceps. I guess I won't mix glue in again.
Manfeo --- do you use a specific type of tea for your coloring ?
or is it hard to see any diference once it gets on the wood ?

On the subject of roof tar...... Most "Tar" in USA is a synthetic
called "plastic roof cement". I don't know if it even has any asphault
in it (!!!!) Is yours the "plastic" type ??????

Tim
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MANFIO
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Joined: 11 Apr 2007
Posts: 458
Location: Sao Paulo

PostPosted: Sat Oct 27, 2007 5:18 pm    Post subject: Reply with quote

Hi! I use English tea (Twinnings or other English tea). I would separate the operations, I would not mix the tea with glue. You could try also 3 or 4% sodium nitrite followed by exposition to UV or sunlight. Allways test in samples first.

Remind that the violin has lot of endgrain... many things that will work on a plane surface will not work with all that endgrain.
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MANFIO
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Joined: 11 Apr 2007
Posts: 458
Location: Sao Paulo

PostPosted: Sat Oct 27, 2007 5:19 pm    Post subject: Reply with quote

Michael Darnton uses roof tar, I got mine from an art shop, in dry form, I diluted it in turpentine to a honey thick consistency.
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Mat Roop
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Joined: 24 Mar 2007
Posts: 911
Location: Wyoming Ontario

PostPosted: Sat Oct 27, 2007 9:54 pm    Post subject: Reply with quote

Jethro, In Canada most roofs are the basic bitumen (asphalt) roofs commonly known as tar and gravel. I don't know what part of the USA you are in, but I am sure that most large roofing companies that install new roofs have Bitumen (asphalt), smaller repair shop types will not have it. Check to be sure you do not get "modified bitumen" which contains synthetic rubber components. Here is a little bit about bitumen...
http://armko.com/newsletter3.php
Check the yellow pages and call around you should be able to get some for nothing... the stuff is cheap!
Good luck, Mat
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jethro
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Joined: 07 Apr 2007
Posts: 178

PostPosted: Thu Nov 01, 2007 2:19 am    Post subject: thanks for the replys Reply with quote

thanks, I will keep my eyes peeled for a road paving project. They are
allways paving here in Florida ! I could just probably scrape some
off their machine !
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Mat Roop
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Joined: 24 Mar 2007
Posts: 911
Location: Wyoming Ontario

PostPosted: Thu Nov 01, 2007 8:03 pm    Post subject: Reply with quote

Try this outfit... I think they are in your neck of the woods.... and when you tell them it is for violin varnish color... they will be impressed and likely give you a sample of a pound or two!
http://www.atlanticbitumen.com/index.html
I am not sure I would use road asphalt...it may have other additives that might not be compatible.
Bitumen= heaviest distillation fraction of crude oil
Asphalt= Bitumen + other aggregates for paving purposes
therefore what you need is bitumen, not asphalt
Good luck, Mat
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