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rgp
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PostPosted: Thu Jan 27, 2005 9:32 am  Post subject:  Nitric Acid on Pine Reply with quoteBottom of PageBack to top

I tried the Nitric Acid to age Pine that you suggested in an article.
I used the 70% with no heat. It turned yellow instead of brown, is there something I can do different?


  
J.B.K.
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PostPosted: Thu Jan 27, 2005 1:18 pm  Post subject:  (No subject) Reply with quoteBottom of PageBack to top

Uh HUH, Add heat! Not trying to be a smart guy but the use of heat to set a chemical stain or have it react faster and deeper the use of a heat element on the wood is important. Also don't forget to nuetralize the acid and be careful. John


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rgp
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PostPosted: Thu Jan 27, 2005 7:41 pm  Post subject:  (No subject) Reply with quoteBottom of PageBack to top

The article said if you use the 70% that you didn't need heat, that's why I didn't!


  
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PostPosted: Thu Jan 27, 2005 8:39 pm  Post subject:  (No subject) Reply with quoteBottom of PageBack to top

Oh i understand, Don't get me wrong in thinking you did anything wrong. The thing in wood finishing is experimenting with materials and techniques, Your going to fail a whole lot more than succeed and the ones usually coming out on top are the ones that keep getting up no matter how many times they hit the canvas. You might want to experiment using tanic acid or adding tannin to the pine. Tannin is the thing that your chemical or acid is trying to react with in the wood, Increasing this % will increase the effect. John


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J.B.K.
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PostPosted: Thu Jan 27, 2005 8:43 pm  Post subject:  (No subject) Reply with quoteBottom of PageBack to top

One more thing, Have you tried fuming with ammonia? John


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Jeff
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PostPosted: Thu Jan 27, 2005 9:52 pm  Post subject:  (No subject) Reply with quoteBottom of PageBack to top

Use a heat gun set on low or a hair drier set on high and see if you get better results.

JJ


  
R Boardman
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PostPosted: Sat Jan 29, 2005 4:53 pm  Post subject:  (No subject) Reply with quoteBottom of PageBack to top

RGB

One reason that you may not be getting the color you want, even though you used a 70% solution, is the initial strength of the Nitric Acid you used. Most solutions have strength determined by molarity (Moles/liter).

So a 70% solution of a 6 molar concentration will act or react differently than a 70% solution of a 3 molar mix. Most acids are sold as 6 molar solutions (listed as "6M" on the bottle).

One other point, if you want to really "age" the pine...leave the acid one for 2 or 3 days, misting every few hours with some water. After 2 -3 days take a wire brush to surface. The acid will break down the softer areas of the wood fiber, which the wire brush will remove. This leaves you with the "wrinkled" look of old, really aged pine. Neutralize after the brushing.

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