yellow and blue sulphur

I have been tld to use sulphur on my horse he cribbs therefore the blue one and I can't remember what the yellow one is for but does anyone use them. The blue sulphur is also known as blue stone.
What do you think about them?

Rather than just trying a quick fix for cribbing, it would be good to rule out a possible health condition. Cribbing has been linked to GI ulcers.

As for sulphur, I've only ever used the yellow and that is to put in my socks before we head into the woods because it keeps away ticks and chiggers.

He only cribbs at certain times. Like he only does it when he is bored in a stable or waiting for his dinner. He never does it when out in a paddock so I think it might be just like a habit.