"Rainbow" is an unofficial term for a very colorful budgie -- usually clearwing opaline yellowface (type1) blues. The wing markings should be as faint as possible. Greywings, and whites (opaline yellowface blue) are also often referred to as rainbows. Rainbows are not recognized as a specific variety for show, but they can be shown as clearwings (where they would most likely not win as opaline clearwings of any variety rarely do because they don't have "clear" wings.) so they would be better off, and usually are, entered as an Any Other Variety rare. However, if one is raising birds for the pet market, the Rainbow is highly sought after as a pet or breeder. By the way, the opaline yellowface (type 1) blue spangle is also spectacular and easier to produce and larger than the true rainbow.
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