Author Topic: "AquaFortis" question  (Read 2279 times)

Offline Molly

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"AquaFortis" question
« on: March 19, 2017, 07:18:34 PM »
In using this product, is the intensity of the color mostly a consequence of:

A.  How much is applied to the wood.

OR

B.  How long it is allowed to set before heat is applied.

OR

C.  How much heat is applied.

I'll bet someone will simply say "YES"!!

Offline EC121

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Re: "AquaFortis" question
« Reply #1 on: March 19, 2017, 07:40:28 PM »
Applying tannic acid to boost what is already there before the AF is also supposed to help.
Brice Stultz

Offline smart dog

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Re: "AquaFortis" question
« Reply #2 on: March 19, 2017, 07:47:35 PM »
Hi Molly,
How much is applied to the wood either by successive coats or concentration will affect color. Time allowed to dry is not a factor.  How much heat will affect color but it is best to keep heating AF until there is no further reddening to drive off all the hydrogen ions.  Therefore, heat temp and time is not really a good way to adjust color.  The other big factor is the wood, particularly tannin content and if tannic acid is painted on the wood, it will bring out more dark tones.

dave
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Offline rich pierce

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Re: "AquaFortis" question
« Reply #3 on: March 19, 2017, 08:56:01 PM »
When I've made my own, different batches had different strengths. Particular pieces of maple sometimes stained differently. So after getting a very dark stock with AQF I diluted that batch in half with water and went to multiple applications.  Each application is brought to maturity of color with heat but just stops getting more intense or deeper in color when fully heated. Wetting with water gives a good sense of how it will look with finish on it.
Andover, Vermont

Offline PPatch

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Re: "AquaFortis" question
« Reply #4 on: March 19, 2017, 08:58:23 PM »
YES... lmaorof...

Do a test inside the barrel channel before proceeding with the whole stock. There are two choices for "AQ," actual AQ or Ferric Nitrate (FN)- both give exactly the same color, or result, identical.

The FN will require no neutralizing after being applied. The FN is mixed with alcohol or water 3:1 or 5:1, the five to one is stronger.  The "heat" must be of the radiating kind, such as would radiate from an electric burner, or an open fire, glowing coals - a  heat gun. The AQ can be applied in stages or layers, some dilute actual AQ before applying. Apply with a wet cloth and be sure and cover the whole stock as evenly as you can.

Prior to applying AQ or FN you can do a coat of tannic acid if you want. See Jim Kibler's website for directions. The tannic acid will immediately turn the stock black, not to worry, it will be a toasty brown after the AQ application.

You can let the stock dry for a few minutes before heating - or go directly to heating. The AQ wants to be hot, but avoid scorching the stock especially on corners or thin areas such as the forestock, keep moving the heat gun. You'll see the wood go a toasty red/brown, move on the the next area.

Where the tree grew determines how much tannic acid it took up, every stock is different and may or may not require multiple coats of AQ. Once you've completed the heating put some water or mineral spirits on the stock to get an idea of how dark it really is before doing another coat. Three go'rounds will make it as dark as it will ever go.

Hope that helps.

dave
« Last Edit: March 19, 2017, 09:00:38 PM by PPatch »
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Offline Molly

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Re: "AquaFortis" question
« Reply #5 on: March 19, 2017, 09:30:10 PM »
I have plenty of scraps to work with although I realize not all will be the same as they are from different sources.  Never thought of diluting with water.  That and a light "coat" with multiple applications might be a good way to go.  (I'm using the product sold by ToTW.)

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