"dyed in the wool"

I'm a bit of a word junkie. I love finding out where expressions come from and their origins. As I was working on yesterday post I began to wonder about the expression "dyed in the wool" 

Here is what I found:

The expression "dyed in the wool" refers to a state of steadfastness, especially with respect to one's political, religious or social beliefs. The expression comes from the fact that fabric can be dyed in a number of ways. The woven fabric may be dyed after it is complete, or the threads may be dyed before they are woven. When a color is "dyed in the wool," the wool itself is dyed before being spun into threads, so the colour is least likely to fade or change.

Dyed in the wool first appeared in the 16th century as a metaphorical expression.

Blessings

Robin