Full Idea
'Grue' is not a colour.
Gist of Idea
'Grue' is not a colour
Source
Tom Milsted (talk [2006]), quoted by PG - Db (ideas)
A Reaction
This simple observation strikes me as rather crucial in assessing Goodman's paradox. Blue is a colour, but grue is some sort of behaviour. Blue is a secondary quality, but grue seems to be a primary quality.