Alps Chemicals Pvt. Ltd. Offers Acid Dyes for Polyamide. Alps Chemicals Pvt. Ltd. Is an ISO 9001:2000, ISO 14000 and ISO 18000 certified company. The Acid Dyes for Polyamide are of different types, they are: Alpanil Yellow 3RL Alpanil Dark Blue "R Alpanil Olive BGL Alpanil Brown 2RL Alpanil Orange RL Alpanil Brown BL Alpanil Scarlet L Alpanil Black MRL Alpanil Red BR Alpanil Bordeaux B