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Cotton is cellulose. So is

Cotton is cellulose. So is linen. And ramie. And hemp. And nettle. All plant fibers are cellulose. Extruded stuff like rayon or Tencel or lyocell is also cellulose, but I’m not clear on the exact chemistry so there may be differences in how it works... but usually extruded stuff isn’t used in paper. For clothing fiber, “bamboo” usually means rayon extruded process. For paper, I’d presume it’s closer to a wood pulp paper process.

Papers with high cotton content tend to be sized differently than wood pulp paper. Nothing to do with chemistry, everything to do with the expected uses.

Anyway, Noodler’s is probably using standard fiber reactive dyes, which react with cotton and other cellulose fibers at room temperature. And the ink tends to have a very high dye load, which means that not all the dye necessarily gets a chance to react to the paper... and that unreacted dye can just float away or form washes when it gets wet. The ink just isn’t designed for watercolor use. It can work! But it’s aimed at specific papers and watercolor paper isn’t it. Noodler’s aesthetic when it comes to paper tends to be pretty cheap, and often their ink performs best on cheap US style wood pulp paper. The more absorbent the better.