My first batch with boiled ground husks and water turned moldy on top. I dumped off the mold and most of the water and added denatured alcohol, no more mold. I could see no reason to strain my grainy mix which is as thick as pancake batter. I stain arrow shafts, bows and other wood by wiping the slurry on the wood, letting it sit for a few minutes and wiping the stain off, I get some really dark stain this way.
My quart bottle of stain is at least 10 years old, I add more alcohol from time to time to keep it liquid.