cudbear

A mordant of alum, followed by a hot bath of brazil wood, and afterwards by a weak one of cudbear.

The above deep red feathers are passed through a bath of cudbear.

Instead of logwood a little madder is sometimes used; also Cudbear or Barwood.

The manufacture of Archil and Cudbear from the various lichens is simple in principle.

The lichens thus treated acquire gradually a deep purple colour, and form the products called "cudbear."