Closing in on Duckshead

After many trials - and failures - Duckshead seems close at hand. This combination of black and silver, intended to mimic the iridescent sheen of a mallard's head feathers, has been frustrating and slow in coming. The latest formula on which tests are being conducted is a proven base glaze used for the Moss Agate. Here is a sample of the base I am now using:
 

Now it's a matter of balancing the coloring oxides to produce that special blend of black and silver. Stay tuned!