Use E-Prep 249 prior to chromates E-Chrome Ultra Blue, E-Chome Ultra Yellow and E-Chrome Ultra Yellow-Red. Use prior to plating with E-Brite Ultra Cu. Temperature: 65–85° F. Concentration: 30–50% by volume. Time: 3–7 minutes.
Use E-Prep 249 prior to chromates E-Chrome Ultra Blue, E-Chome Ultra Yellow and E-Chrome Ultra Yellow-Red. Use prior to plating with E-Brite Ultra Cu. Temperature: 65–85° F. Concentration: 30–50% by volume. Time: 3–7 minutes.
