You may find that walnut will bleach out if exposed to sunlight if the finish doesn't have any UV prohibitors.When exposed to light, all woods darken with time, regardless if they have been stained or not.
I have not found this to be true to any significant amount.Aqua fortis will darken over time unless you kill it after Blushing it. I was taught to use a solution of baking soda and water, put all the baking soda in the water that it will absorb and then liberally apply to the stock.
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