We generally do the ant 6 only Al but some times the buc corridor forces us to alter our transition to get things to blend, I think I just missed this on my design.
We do stain the gingival with ZZ stains and layer a very very thin layer of glass. The pink glass is really amazing the color you can get in micro layers with the pink underlayment. This case the tech I am interested to see out of the sintering oven.