Currently it's not possible to set a specific Color in the Color adjustment Settings of a character/prop etc.
I have to use the Brightness, Contrast,Hue and Saturation to set any Color.

Often i want to set a specific Color for an item (rgb or hex-code) - ist not possible exactly. :-(

This has been requested so many times, it often makes me wonder why it's never been implemented...

yes, for me ist a big Problem when i create movies where i have to set an exact Color due to a style guide.

I saw an email that EZColours has a product in the Marketplace that will enable us to specify a colour, as well as an entire palette.
It looks pretty cool.  I understand it's a extra expense but maybe one worth purchasing.  Possibly RL will consider purchasing the code and incorporating it into the next update.  Hint Hint, nudge, nudge!