Well....live and learn! I hope others (likely like me....1st time builders) will benefit from my experience here. When I applied the Aquafortis I did it in, I'll call it "large areas." By that I did the length of the forend....one side, then the other. Then I did the stock from rear to lock panels, flipped it and did the other side.
Well, what I ended up with was some brown......and a lot (A LOT) of green. Now, I have read the instructions and they address and it states that flourcent light will show the green cast. I'm looking at this outside in daylight.
This morning I sanded one side of the stock down, applied AQ to just a side panel, applied heat immediately and got the nice brown I was looking for. When I initially did the AQ, there was enough time for it to dry out somewhat.....and I think that is why I got the green. And yes.....I did apply a sufficient amount of heat! Heat gun and that stock could not be touched!!
Well, I'm in the process of removing "green" and will do the stock in small sections when it's ready.....again.