You will be given a trivia clue, and the category it belongs to. You should answer with the best answer that belongs in the category and is described by the clue. For simplicity, answers should be in all lower cased letters.

Category: SHADES OF BLUE 
Clue: Saint Tropez & Cannes are on a coast named for this color
the azure coast

Category: BRAND NAMES 
Clue: This brand of petroleum jelly was selling a jar a minute in the U.S. by the 1880s, & it's still a favorite
vaseline

Category: THE LOOKING GLASS 
Clue: Anton von Leeuwenhoek ground lenses to make these, which magnified objects up to more than 200 times

microscopes