FEATHERING - Indenting textures in to slip using a feather.
ca: A LA PLOMA
Feathering is to use a feather to indent a texture into glazes and was one of the first instruments used for decorating pottery. Dry clay is covered with a slip, over it using a slip trailer apply lines using a different color, then with a feather you comb through the lines. Both colors must be fluid and great care has to be taken not to scratch the clay as it will dirty the colors.
Read more about: Combing