How to change color, how to get a full list of colors

[AxeloLabs]

hello,
i am trying unsuccessfully to custum the colors, it is very painfull, sorry.

this is the error I have:
#############################
export H_COLORS_FG="bold black on_rgb520","bold red on_rgb025" (=> why is ther an on_ appearing there ?)

export H_COLORS_BG="underline bold rgb520","underline bold rgb025"

🕙 09:25:39 ❯ echo a | h a
Invalid attribute name on_rgb520,bold at /opt/homebrew/bin/ack line 993.
#############################

• please, I would like a page, where I can see and simply copy paste the colors in your env variable, so it works easily and I know easily the colors I am using, because I want more than 12 colors. Is there one ?
• or could ACK or another tool do the same job easier ? kind of highlight alternative in 2023 ?
• do I need to setup your env variable before or after : source "$COSMOS_LIB/h/h.sh" ?
• what is the recommended way to pipe hightlight colors if more than 12 colors needed ?
• is that normal that sometimes, when opening, closing the bash,, I do not know why, it is like colors are not displaying in the same order, the red become green , on not background become background color... I did not succeed to identify the case where this happen ?

tks a lot