I got some time to get into darkroom again. This time, I added fresh water rinses after each stage, developer, blix and RA-rinse. With this, the blue tint I got from last time is totally gone. So clearly that blue/cyan color coating is not part of the color layer, but just some top coating for other optical purpose.

The water rinsing does add about 2 more minutes processing time. But I figure this is helpful with the good photo quality and good for chemicals too. I used to do a complete rinse with final prints, not with test strips...