I have a new glaze, red mottled ( 2460 from Cerama). I have tried it on different clays and in combination with slate grey ( 1318 from Cerama).
The two first pictures ( top left and in the middle of the top line) Here is the mug made in an clay with a lot of ion :
The mug is first glazed with the red glaze and after drying, it is glaze with the grey glaze.
The mug in the top right corner and the bottom left corner, has the same glaze, but it is made in a nearly white clay:
The last mug, is made in the clay with ion (591) but it is only glazed with the red color.