I've never worked with Alder so can't say yes or no. However, you can
always mix-up a solution of tannic acid to brush on the boards first.
Tannic acid is available as a powder which you mix with water yourself.
It's fairly benign stuff, so not too much to worry about. Got mine
from Post Apple Scientific off the web.
One caveat: Tannic acid will usually add enough tannin to react with
the ammonia. However, the resulting look isn't always pretty. On ash
and maple, two woods notably week in natural tannins, the wood comes
out a mousy brown...not particularly attractive at all.
On some wood, particularly cherry, I find the tannic acid helps control
the uniformity of the fuming. If you're not working with boards from
the same tree, it can often be a good idea to help out mother nature
Good luck, and let us know how it comes out!
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