Testing by a Montana Guild member shows that there is no difference in color between the crystals and a stain with acid.
Does ferric nitrate corrode metal like the AF made from nitric acid?
Never used the stuff
If its made and used right acid stain does not corrode metal so I don't see a problem with the crystals.
Dan
Thank you Dan for the insight on what I did wrong. It will go a long way towards helping on my next build.
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I was more curt than I should have been accept my apology.
The proper use of AF has been detailed a number of times here on the site.
If its made right, and I would not trust the store bought stuff to be so, applied and then reacted with radiant heat to heat the wood well. Then neutralized to kill any remaining acid there should be no problem.
The only acid stained guns I have had problems with were with store stain containing both nitric and hydrochloric acids.
In making the stain with acid it is possible to add iron/steel till it will dissolve no more and the acid will be depleted or nearly so.
Nor does it seem to matter what the source of iron is. Old wagon tires, steel wool or small finishing nails all give the same color, as does the nitrate of iron crystals from what I have seen.
The neutralizing wash should be water with a high baking soda content but not so much as to leave undissolved soda on the stock. It is not uncommon to have the solution show some bubbling when its applied. This shows the remaining acid is being reduced. So any place the stain touches needs the soda solution applied.
While I have a stock done back in the 90's with store bought stain that is excessively "muddy" it has never shown any corrosion of any metal parts. I believe this is the result of the stain being intentionally adulterated with hydrochloric acid.
Dan