Is there a command to change the color of your text to the default color? No, I'm not talking about Control + K1. That makes the color black, and anyone using a client with a different color scheme will see black instead of their chosen default color.

You can use Alt+K to open the colors dialog or you can change it using the /color command.

/help /color

You want others to see it as their default color? Just don't include color codes or else use Ctrl-O or Ctrk-K (without a number) to set color to default.

$color could be used too....

If you mean you want a control code that makes your text the default color, try Ctrl+O.

Ctrl+K99 should do the trick.

Ctrl+O will do it too but it also resets the background colour and any other control codes, which might not always be desirable.

I always use two colorcode-character after eachother for historical reasons. So historical, that I don't even remember why.