GIMP Version: 2.10.28
Operating System: Windows
OS Version: 10
GIMP Experience: Intermediate Level

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I have an abr file of watercolour style brushes that works fine in Gimp, except that square edges are slightly visible around the brush pattern - i.e. the edges of the brush image are not completely transparent. In order to try to rectify this, I converted the abr file to separate png files and made the edges transparent. I then converted these files to Gimp gbr brush files.

My problem is that all the brushes, except the first one to be converted, now only operate in black and will not accept the colour I set as the foreground colour. Clearly something has happened in the conversion process. Is there some way of editing the brush files so that they can paint in colour, as the first one does?

The brushes must be in grayscale mode and flattened.

I find that by setting the dynamics to "random color" they work normally.

What in this context does "random" mean?

Color sampled at random in the current gradient....