anyway, it all depends on what your definition of rainbow is. i think of a rainbow bta, acan, lobo, ect as having 3 or more colors. i have seen local shops and reefers selling nems with 3 - 4 colors and referring to them as rose bta's though. i also posted a pic of one of my bta's that has 4 distinct colors and someone on the forums told me "it's just a rose" lol so... once again... it all depends on your definition.
if you like it, does it really matter? i started off wanting named things, and then i started learning about the hype. people chase names and pay much higher prices just to get it. any more, i just chase what i think looks nice. enough of my ranting... lol
i vote that you get some better pics of the bta and post them so that we can all enjoy