Layer Mask not working, leaves subtle transparent halo 21.0.1

[DesIndie]

No matter what I do, since I updated to the latest Adobe CC photoshop, layer masks will not remove the content entirely, but leaves a halo tranpsarent effect on artwork. 

https://youtu.be/DCpyD_8O0fo

[valerie.bolitho]

I'm having same issue. I was on hold with tech support for 2 hours and no resolution. He told me I was doing something wrong. 

[davescm · Accepted solution]

Check your brush colour. It is not quite black in that video i.e. RGB 0,0,0

Dave

[kaylab35385803]

This solved the problem for me. Even though it looked like my brush was black, it wasn't 100% (RGB 0,0,0) so wasn't hiding 100% of the pixels. I reset my brush to the default black/white swatches and didn't have any more issues.