Keeping Track of Glazes

I am going to use this tray which has been stenciled with a grid 

as a test for different glazes, so I took a picture of the tray

with the first glaze areas in place, then posterized it

and printed it out.

As I add additional swirls of glaze, I will use a pencil to shade

in those areas on the printed copy and write the glaze name

in the borders so I know what I used where.