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Do you like my varnish color?


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#1 M_A_T_T

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Posted 28 July 2007 - 03:43 PM

Been doing some varnish testing with oil varnish. Here is a piece of rib stock. It has two coats of 1/2lb cut orange shellac, and only ONE freshly applied coat of my test oil varnish for now. Do you think with subsequent coats it will turn intro a desirable color?

Here is the varnsih recipe I used:

10ml of Damar Resin crushed into powder
15ml of #915 Eco-House Orange Terpene Solvent
2-parts Asphaltum
1-part Alizarin Crimson
2-parts Indian Yellow
10ml Walnut Alkyd Medium.

This comes out extremely watery and leaving the lid off for a week to let the solvent evaporate thickened it to something like honey, which I then used.



#2 MANFIO

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Posted 28 July 2007 - 04:15 PM

I would use more colour, getting the colour near the wood helps transparency.

#3 Darren Molnar

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Posted 28 July 2007 - 04:18 PM

Looks nice Matt.



As to your question of subsequent coats, I've learned a hard fought
lesson this summer. Mainly, if the colour of the wood is too
bright, more coats of varnish doesn't make the final colour a warm
tone no matter the number of coats.You will get more colour, but,
will always see that white wood shine through it.



I imagine that varnish of yours over a warm cinnamon wood and I
think it would be stunning.



If I imagine it over fresh white wood, I don't think think you'll
be happy with it in the end.
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#4 MANFIO

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Posted 28 July 2007 - 04:47 PM

I agree with Darren. I would tan the wood in the sun or UV box, use some strong tea and perpahs 4% potassium nitrite to darken the wood first.

#5 Collin

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Posted 28 July 2007 - 04:51 PM

I think this would be great as a base coat - but I would use a red oil varnish over it.

From most examples I'e seen, better results come from several different colors being used - for example, a yellowish-brown like what you have on top of the ground, then madder-colored varnish.
Twentieth-century art may start with nothing, but it flourishes by virtue of its belief in itself, in the possibility of control over what seems essentially uncontrollable, in the coherence of the inchoate, and in its ability to create its own values.
-T. S. Eliot

#6 Janito

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Posted 28 July 2007 - 05:22 PM

MATT

You might consider experimenting on a test rib by dividing it up and applying progressively more coats to each section?

3 questions:
- Does the orange terpene affect the rate of 'drying'?
-Is there any residue that you can see in a clear glass container if you allow the solvent to evaporate completely?
- In a section with multiple coats that is dry, can you indent easily with a nail or does it crackle off?
Thanks

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#7 MANFIO

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Posted 28 July 2007 - 05:52 PM

Michael Darnton used to say here that he starts with red and follows with yellow. It really works well.

#8 Darren Molnar

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Posted 28 July 2007 - 08:28 PM

" Michael
Darnton used to say here that he starts with red and follows with
yellow. It really works well. "
 Manfio






That reminds me of the fat over
lean rule for oil content.  In this
case you could call it the "light over heavy colour rule"
Works very well.




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" please to forgive delivery of violin, reason for the strong heat of the sun, to put cracks in my logic. "




#9 Darren Molnar

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Posted 28 July 2007 - 08:29 PM

Manfio, could you tell us more about this potassium nitrite?
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" please to forgive delivery of violin, reason for the strong heat of the sun, to put cracks in my logic. "




#10 Darren Molnar

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Posted 28 July 2007 - 08:52 PM

What I mean is, how has been your experience with it. I haven't
tried it yet.
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" please to forgive delivery of violin, reason for the strong heat of the sun, to put cracks in my logic. "




#11 MANFIO

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Posted 28 July 2007 - 09:12 PM

As a matter of fact I use sodium nitrite, it's less expensive and easier to buy. Make a 4% solution and apply over bare wood and expose it to the sun for some hours (test in samples first).

#12 M_A_T_T

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Posted 28 July 2007 - 09:21 PM

quote:


Originally posted by: Janito
3 questions:

- Does the orange terpene affect the rate of 'drying'?

-Is there any residue that you can see in a clear glass container if you allow the solvent to evaporate completely?

- In a section with multiple coats that is dry, can you indent easily with a nail or does it crackle off?

Thanks


1) I do not know, not enough experience with it. What should I look for?

2) You mean just solvent alone?

3) I'll report back when I have applied more coats. Which is more desirable, crackling off?

#13 Janito

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Posted 28 July 2007 - 09:53 PM

MATT
Does the varnish remain tacky after days in light, hours in a UV box?
Does solvent alone leave a residue after evaporation?
I meant to say 'chipping off', indicating poor adhesion to lower coats. You might also want to check the adhesion to the shellac coat.
Some soft varnishes can be imprinted by the lining of a case, for example, so the balance of adhesion to these materials versus undercoats can mean the difference between ecstasy and despair!
If you achieve a craquelure effect, this can look very attractive.

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#14 M_A_T_T

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Posted 28 July 2007 - 09:59 PM

quote:


Originally posted by: Janito
Does the varnish remain tacky after days in light, hours in a UV box?

Does solvent alone leave a residue after evaporation?


I don't have a UV box, I am using daylight through a window. I'll let you know. I'll also put some solvent in a glass jar and see what is left when it evaporates.

#15 Janito

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Posted 28 July 2007 - 10:23 PM

Window glass is a great UV filter.
You are much better off putting the test strip or instrument in direct sunshire for a few hours (watch for over- heating).

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#16 Andres Sender

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Posted 28 July 2007 - 10:28 PM

You won't know how you're doing for transparency until you have the full darkness you want.
The problem with the ignore feature is that if one has a sort of morbid fascination for train wrecks one can keep peeking and then the benefit is out the window.

#17 M_A_T_T

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Posted 28 July 2007 - 11:02 PM

quote:


Originally posted by: Andres Sender
You won't know how you're doing for transparency until you have the full darkness you want.


I know. I will be putting more coats on.

#18 eds

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Posted 29 July 2007 - 10:56 AM

Manfio , can you describe how you make a 4% sodium nitrite
solution. Thanks.

#19 Bob A

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Posted 29 July 2007 - 11:48 AM

4 grams of sodium nitrite dissolved in distilled water of sufficient amount to make 100cc of solution.

(1 gram of water = 1cc)

#20 eds

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Posted 29 July 2007 - 02:14 PM

Bob A , That was very helpful , thanks for the response.




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