I typically do not rinse my dry yeast however, I figured that since I do for the liquid strains, I might as well do it for the dry strains. I just kegged an IPA (5 gal) that was fermented on 2 packs of US-05. I dumped all of the trub into a 1-gal jug, filled with distilled water, shook and capped. An hour later, I come back to about 4" of solid-colored material. Is it possible that this is all yeast? I'm typically able to rinse a small amount after each batch, maybe a tablespoon or two (obviously, I cannot measure the actual amount being it's in with distilled water) but never have I seen this. I'm thinking it's trub but you could see a couple inches of trub at the bottom. The 4" above that is all 1 color. I tried to upload a picture but the window doesn't close on it's own allowing me to upload it.