Explanatory notes
… natural resins or silicic acid. (3) Agents to produce dirt‑repellent finishes . These are generally based on … ammonium, chromium or iron sulphates or acetates, potassium dichromate, antimony potassium tartrate) or tannin. (But see … may be based on rosin soaps, fortified resins, wax dispersions, paraffin dispersions, acrylic polymers, starch …