Custom highlight color outside the 16-set cterm palette?

Hi,

I am using xfce4-terminal and xterm.

I would like to highlight tab indents with a custom color, which is not
in the 16-set cterm palette.

Currently I have:

highlight SpecialKey ctermfg=grey ctermbg=black

I would like to use '#222222' instead of 'black' for background
*without* that affecting any other color in the color scheme.

How can I do that?

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