Hi,
No, because I use the lye water to neutralize any residual acidity after blushing the ferric nitrate. Theoretically, you don't have to neutralize ferric nitrate after blushing because of the initial low acidity and the heat drives off the residual hydrogen ions. However, a basic solution (lye, ammonia, baking soda, etc) just assures no acids are left and the additional benefit of the lye is it reddens the color. Let me relate a story. I wanted to match the light orangey color of the original Edward Marshall rifle on my copy of it. I did all kinds of experiments on scrap wood using really dilute ferric nitrate stain. I thought I had it just right then I stained the gun. After blushing, it looked terrible, like a plain gray brown board sprayed with thin magenta paint. So I hit it with lye water and boom, the color I wanted appeared immediately. Here is that gun.
dave