Where EXACTLY can black butterflies be found?

[Dylawa]

"Eden" and "areas like Prairie Peaks" is not specific enough-- especially when I DID go to prairie peaks, and there were ZERO black butterflies. The spawn rates of certain colors need major overhauling-- I have far more red than I could ever actually use.

[Snepderg]

Eden and most areas of Golden Wasteland. Black butterflies have a 5% spawnrate, which is the same as White butterflies in Day Prairie. However, Day Prairie is special in that Prairie Peaks has a 15% spawnrate.

Why are they so rare? Because this is TGC's way of adjusting the butterfly amount when you can only get one bottle of white and black per day.

For Black butterflies, don't forget to check side areas such as Treasure Reef and the Forgotten Ark.

No worries though, all you need to do is touch one white butterfly and one black butterfly (emote / deep call to collect some light from 'em). Dye plants reset at the top of the hour, every hour.

[D:\side\]

I don't think Prairie Peaks have any black ones. The quest directs you there for the white ones I believe.

Indeed, most Wasteland areas have black butterflies regularly, mixed with blues and purples. The first area behind the locked gate in Eden past the two stone streams has a few hefty plants mostly out of reds and blacks.

And I'm pretty sure blacks and whites are supposed to be rare, given the prices of respectively colored capes even before dyes were introduced at all.

[Yonaneii]

The black dye can currently be found in the first area of Eden before the point of no return, all the areas of the Golden Wasteland including the seasonal areas, and the Archives in the Vault of Knowledge.
Technically the Windpaths have a little bit of every dye to but it's not a main area you should be going for black dye.