I just delay putting them on to towards the end of the cook. But if they're part of your rub, that's pretty hard to delay. Is it the color that's bothering you or the flavor? If it's just the color, then just say "it's part of the bark."Interesting. Garlic/onion powder are the last items two spices I would have looked to as the culprit. Do you recommend any savory spices that do not turn black?
You forgot to add, IMO
This might be helpful to the OP and others:
http://amazingribs.com/recipes/rubs_pastes_marinades_and_brines/the_science_of_rubs.html
Why no salt? That's undoubtedly the difference in appearance at this point.
Most details about rubs are personal preference issues. My wife, for example doesn't like nearly as much black pepper as many recipes call for. That's the beauty of the "no salt" rub. You adjust the amount of salt to the piece of meat and to your liking.
Salt is producing the sweat in the butcher's rub.
Bingo. You need salt because it is the transporter of your flavors.
Adam,
We need a definition of "sprinkle". If you waved a shaker over your rack a couple times, I am going to guess you didn't have nearly enough salt. Your taste buds should help you out here a lot. 99 times out of 100 (particularly among those new to cooking) "bland" equates to "not enough salt". When you go overboard, it's pretty easy to tell, too.
It was less than a teaspoon. I'm not new to cooking and taste was not an issue. It was most certainly not bland. In fact, I think I'm really close to nailing the flavor profile that I want in the rub. I'm just concerned at the lack of sweat - which was pointed out to me was because I did not add enough salt. It is my understanding that the meat needs to sweat in order to even out the rub and build the best bark. If that is not correct, than I'm good. But, all of the commercial rubs seem to cause that reaction very quickly. And, please do not tell me to simply let the meat to sit longer. Thanks again for everyone's help. I wish I could give you all a bite.