Cellulose fibers

Cellulose fibers are those which are derived from plant sources.  Bamboo is a cellulose fiber, so is tencel (which is derived from wood chips ... did you know that?).  Silk is not exactly a cellulose fiber because it is produced by a domesticated insect, but it acts like both a cellulose fiber and a protein fiber, so we consider it in this category.

Acid dyes are used for dyeing wools.  The interesting thing about dyeing blends of protein based fibers, like the wools (and you and me, for that matter), is that the acid dyes will strike the cellulose fibers differently from how they strike protein fibers.  The results are often slightly muted, and always beautiful.