coffee and some nuts will work the same way as described for tea above. i do tend to let it (steep) longer than 15 minutes and i let mine dry-cure before heat setting and rinsing but how ever you do it it works...time to experiment a bit. different strengths; you want some agitation to help with even=ness, or you may wind up with a mottled fabric. start with a couple fq's and see if you want to really darken your fabric or just take the glare off.