Had this happen a few times now. When trying to get a rich black wash, as the wash dries it turns a very “white grey”. In this case I had just used Super Sat Velour Black and water on raw wood.
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I ended up using a water based minwax stain that I am SUPER happy with! Think that this will be my go-to when I need a very “black” wash from now on- also “played nice” when added to my paint washes! Highly recommend!