Done it. I put out a brown one years ago and wasn't getting as many pics as the year before. Talking to JD I told him I put a brown one out, he told me they like the white ones better. Made sense as the year before there was a white one and I got far more pics. So I went and got a white one and put it beside the brown one. Deer pictures increased and i would say they preferred the white one 90% over the brown one. The reality is deer really only want the salt. That's the only real attractant. The minerals we give them we kinda slip in there and make them consume it as they go for the salt. Kind of like if you need salt but some government asshole mandated it be iodized so you don't get a goiter. We just want the salt, by proxy they're making us take iodine.