I talked to Ed Fowler a while back about straightening sheep horn.He put me in touch with a friend of his who does it.This is the gist of the conversation.
Don't boil it.He says it will make it too gummy to use,and mess up the look.He says cut the sheep horn and put it in a toaster oven at 200 degrees F.Let it heat for 15 or 20 minutes and clamp it between press blocks of wood.If it is too stiff to bend,put it back and raise the temperature 15-20 degrees and try again.Do this until you are able to press the scale flat.Let cool for a day or so and flatten on a grinder.It may take a couple of treatments to get it permanently straightened.He said this works for a variety of horn.I would make a press block to straighten the horn and try the whole piece.Boiling does work (I've done it that way with cow horn),but Ed's friend says that it is best to use dry heat.Some people put the horn in a can of dry sand and put the whole mess in the oven to heat throughout and slowly.
) 
