Why the bar magnet available in the market is always painted fully red?

Answer 1

There may be an international colour code for magnet.

Answer 2

Magnets has a peculiar property. When it comes in contact with other magnets or iron, the magnetic ions jumps to other, this trend is more if a magnet is kept on on an iron bar.

In market, they have to keep, magnets in bulk, one over other or near. To avoid the magnetic ions jump, and to keep its property intact, they paint red. Red paints avoid a magnet to keep it properties intact.