How to change default text color in Calc

I have created my own Sudoku worksheet and I would like to change my default text color to a different color after I have added the default numbers, is this possible (easy I hope).

I have enclosed my worksheet as a reference.

BTW - if you were to stroll to the right, you would get the answers.

Thanks ahead for any suggestions or solutions and be safe.03-04 Sudoku Puzzle 3x3.ods

A sample of what I need, blk is original numbers and he blue are my “solution” numbers.

Edit default’s style, [F11] and right-click on default style to modify, select tab ‘Font effects’ - ‘Font color’

This changes the default colors, so if I already have “numbers” in the spreadsheet then they will change as well. This is not what I am looking for. If there is a way to “lock” the current text (number) color and then change to a different color, that will work (I think).

I just notice that I said “text” colors, I mean numbers. Sorry about using the wrong word here.

Take a look in the help on how to set a color for numbers format.Format numbers help