Natural 1. Oldest 2. Color Change 3. Fewer Colors 4. Inconsistent 5. Hard On Wool 6. Dullest 7. Fades In Light

Aniline (developed in 1856. No longer used) 1. Corrosive 2. Colors Faded 3. Colors Ran 4. Ruined Many Fine Rugs

Acid 1. Cheap 2. Colors Run

Chrome (developed in 1920's & 1930's) 1. Resists Acids, Alkalis, Washing & Light 2. Won't Harm Wool 3. Over 600 Colors 4. Colors Are Fast 5. Won't Run or Streak