Clays are Plainsman H450 and H550. The L3954N black engobe was applied at leather hard stage (on the insides and partway down the outsides). The insides are glazed with GR10-C Ravenscrag silky matte (and the outside of the one on the left). The outside of the other is G2571A Bamboo.
GR10-C - Ravenscrag Cone 10R Silky Talc Matte
Just Ravenscrag Slip plus 10% talc produces a visually variegated surface that feels silky and looks stunning!