Summary for black hardcoat anodizing Discussion
The focus keyphrase "black hardcoat anodizing" fits this thread about a Type 3 Class 2 anodize job where the coater can meet the required 40–60 micron thickness but still cannot match the customer’s black sample after dyeing. The question centers on why the color is off even though the coating thickness is correct. Because the excerpt only includes the question and no replies, the page does not provide a named expert answer or a confirmed cause. The practical takeaway is that matching black on hardcoat anodizing can depend on more than thickness alone, and the missing discussion would likely need to address process variables such as dye uptake, alloy, sealing, or coating structure. Based on the available text, no definitive solution is stated in the thread excerpt.
July 27, 2021
Q. I have a customer part which is requesting for Type 3 Class 2 Anodizing, we are able to meet the thickness of the coat which is 40-60 microns, however after black dyeing I can’t seem to match the color of a sample piece given to me by the customer.

Details of my process are below.
Part Material : Alu 5083
Dye: Sanodal Deep Black MlW
Dye Concentration: 10g/l
Temp : 55-60
Immersion time 10-20mins
Please advise.
Tommy See
– Singapore
A. Tommy
The pores of Type III anodize are much smaller than those produced with Type II anodize. At a minimum, better rinsing is required.
Consider reviewing the FAQ’s on this website (Introduction to Anodizing of Aluminum) for guidance on post anodize treatments, or review post 56305 for some tips.
Willie Alexander
– Green Mountain Falls, Colorado
August 3, 2021