GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: New User
I just tested a texture on a transparent layer then I came back to another layer where I wanted to use a brush with black and impossible, the brush uses the texture that I tested, and yet this texture is not not in the clipboard.

I would like to know why this happened and also know how to find the black. If I open an additional layer, I still do not have the black but if I open another image, I find black again.
I'm looking for 1h ...
Then I looked for the channels by alternately closing the eyes and now it's worse ... and now I paint with the colorful texture!
On the side of the channels, the green is selected and I paint with the texture in pink.I also do not see how to reset to not have a selected color (nothing found in the channel menu)