The green mugs on the left picture are made with light clay with spots( silicanordic 930), and glazed with copper green ( cerama 1373). The mug on the right picture is glazed with the same glaze, but made of purple clay ( silicanordic 591) and this clay must “eat” the color, I can see it on the bottom edge of the mug. I can’t decide if I like it or not.