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This procedure is sometimes used when a union dyeing(fibers are same shade) is desired. Orcolan Neutral™ dyes are recommended for the nylon as they are applied at a pH near neutral.  If the substrate being processed is rayon, do not exceed a pH of 9 as it will cause saponification of the fiber.

  1. Prepare goods as necessary.
  2. In a bath at 105°F(41°C), add:
  1. Set pH to 9 using ammonium hydroxide and run for 10 minutes.
  2. Add Orco™ Acid dye properly prepared
  3. Circulate for 5 minutes.
  4. Add Orco™ Direct dye properly prepared
  5. Circulate for 5 minutes.
  6. Add 20 % owg Common or Glauber’s salt and raise temperature to 160°F(71°C) over 20 minutes.
  7. Adjust pH to 6.0-6.5 and increase temperature to 200°F(93°C) over 30 minutes and continue for one hour.
  8. Drop bath and rinse well.
  9. Finish goods as necessary.

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