I googled it and it is an acidic fertilizer for camelias, azealeas, gardenias, etc. I wouldn't compost it.

If your going organic, I would give it to a friend, it will through your compost completely out of wack. I am not an organic grower, but I do use a lot of organic products. I kind of take the best of both worlds approach: prepare your soils with good organic products (manure, compost, fish emulsion, hoof and horn, greensand, and whatever else), then amend any lower levels with specific fertilizers; companion plants always work better then pesticides, so non of those. I'm sure a lot of people have a problem with that, but I get the rich and healthful flavor and effects of organic, with the excess productivity of non organic. It works for me.