Foaming: Myth or Truth?

I've been told a few times that a horse foams at the mouth when the rider has soft hands and the horse is relaxed...question is, is this true? Do any of you out there know (have proof?)? I just wondered...Daisy's been foaming a lot lately, particularly today when we worked on flying lead changes...at one point, so much foam was dripping from her mouth that it flew up and hit her in the face :P.

I'm using a stainless steel bit in the photos above (Doesn't copper make horses foam? B/c I use a copper Tom Thumb for western or a copper curb and Daisy never foamed).
Just a question for thought... :)

Jr. Cutter Curb Bit

Hey! Sorry I haven't posted, but I'm back! People kept bugging me to post, sooooo...

4H requires that if you are riding a horse that is over 6 years old one handed (neck reining western) that you use a curb bit instead of a snaffle. I've been riding with a snaffle the whole time (this is what a snaffle looks like) so before the fair I had to borrow a curb bit (the one Daisy's wearing in the second pic) and ride in it. It was like riding a different horse! Daisy behaved MUCH better-she moved better and was easier to control, and she liked it as well. If you use a snaffle bit riding one handed it's a harsh bit because of the way it moves, but the curb is meant for one hand reining. You also use a curb strap (curb chain) under the horses chin. When you pull back on the reins to ask the horse to stop, it first puts pressure on the top of the horse's head. Some horses will stop because of that pressure already, but if they don't the bit then comes back farther and causes the chain under their chin to dig into their chin and make them stop. I bought my own curb bit now (the one above) and I use it on Daisy, and she's great. Although, it is a lot harder to stop her when we're galloping on the road-I've learned to use my seat and my voice more often now (sitting deep in the saddle, leaning back, squeezing my thighs, putting my heels down, and saying "Whoa".). I kind of wish it'd be easier to stop Daisy (ESPECIALLY when I let her out in a full gallop along the road-she's FAST!) but I suppose it's a "learning experience". LOL...so, here's my not-that-great post. :)

2:03 PM