It actually didnt let me to do so, I could only have greyscale slider while working with mask, BUT...as I`ve been trying it, I clicked "swatches" just to see whats that for, and there I found something like gradated colors, also including white with shades of grey, and there when I clicked on the "whitest of whites", it worked just as I wanted, so now I can achieve "true black" when brushing mask back, so thanks for your help, without you I probably would never try this option, thanks again 
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Re: Masking with brush problem
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