white tantra in my comprehension through gnosis, is that the most fundamental aspects are to 1) abstain from spilling the seminal fluid, or orgasm, and 2) to practice with one spouse only.
There is extensive information on this site: www.gnosticteachings.org
check out the sacred sex pages....

Thankfully, the color-coding of tantra makes it way easier to remember.>
White is nice, black is nasty, and red is like the color they all wear at the Osho Meditation Resort in Puna.
I was looking at a youtube vid of the dervish whirling they do there, all in red.
I wonder if it all means something? Anyway, it looks like they were having fun.

All of us have one thing in common>>>
each of us has his own color. And all together we are like a rainbow.
Graphic computer programs recognize a couple million colors. It's not that simple. Each human individual on this planet, past present and future, literally represents one very particular place in the spectrum. No two alike. Your color is your identity, just like your own DNA. So there are now billions of colors.

Science tells us that all colors mixed form white.... and that black can be seen as the absence of light.... kind of like the deep black Yin to the intense heavenly red Yang.

The spectrum of visible light goes from infra-red all the way to ultra-violet. ...just like the chakras ascending from base red up to violet-white. And that's as fundamental as it gets.

As to which school you follow, well each school has it's place somewhere in the ascending scale of color. And I wouldn't reduce it to three or four only, but that can be a starting point for many as a way to begin understanding of this kind of sensibility.

Not everything that's out there purporting to be The Truth necessarily harmonizes one with the other.

Again, according to Yogic Practice, which is the fundamental part of Tantra, you'll have 7 main maha-chakras, and many minor chakras. The seven from bottom on up are colored starting with red, going all the way up to violet/white, with the other 5 major colors in between.. A good memory tool is a guy's name "Roy G. Biv" = red, orange yellow green blue indigo violet/white. This accords with the science of Yoga, as well as the yoga of Science.

It's probably not a good idea, maybe confusing, to try and force dharma from other schools & practices & cultures into this because those are coming from other places. But if they agree, then that lends strength to This Dharma. ...{veritas nostra}

-yellow hats: reference to Lamaism?... which has different color sets from Brahmaism and different even from Theravada color sets.
-Indigo-Orgasmic? ... sounds like kinda 60s psychedelick... farout cool mon!
-Great White Brotherhood? I think Dunov was coming from yoga rather than yoga coming from Dunov.
- Druids? There may be some correspondence in that early proto-yoga also developed and evolved in primeval forests. However, the light in the tropical Indian sub-continent is way more intense in the infra-red end of the scale than is the light in England where everything is filtered through a bunch of clouds so is more heavily weighted towards the ultra-violet end of the scale.
-skin color? Actually humans are not clearly from five different colors like five different crayolas, but are just varying shades of basic human skin color, going from pinkish pale skin on through dark Hershey brown --- And I don't agree with calling people white yellow red or black because when you look at them close they're not really that, but just mostly different shades of brown.

So just look up "chakras" in your wiki and any other stuff you can get on chakras and learn from there. Chakras are the energy wheels that connect the 72,000 Prana Nadis [energy lines] through which all Kundalini flows. And a knowledge of your own body's circuitry is pretty vital to an understanding of how Tantra works. If you think Tantra is all just sex-talk and blowjobs held together with a superficial layer of spirit-talk, then you're coming from a pretty primitive, and sometimes dirty & ugly, misunderstanding of what Tantra is.

Remember to share what you find out.