The slips are a category of seats in concert halls and Theatres ,this is nothing to do with that. It doesn’t mean standing next to the wicket keeper either.
Slips are liquid clays used for decoration there are a whole spectrum of colours, I like to use clays from out and about on my travels. They are from places like the river bank of the river Wandle ( WC ) wandle clay. River Thames mud from outside River house in Nine Elms which I call MI 6, sea shore clay from Itchenor Sussex which is called Itchy slip where I gather the clay from the slipway which I call slip slip. Some of the names are quite boring though like Dicker slip from Dicker or Alf Riston from Alfriston.
I have 14 slips,some are running out and I wont be able to replace them,WC is from the river bank and I would feel terrible if I cut that away anymore than I have done. I am sure that other places in England will offer up some earthly presents. I collected one from France which is called French lake slip.
They are used at the all the temperatures I work at,the higher the temperature the more change there is, some go from brown at 1060 to green at 1300 reduced.
Slips are a great way to decorate a pot .