as @Ekopalypse said, the post directly above yours, which you replied to, already answered your question. There are only the 5 individual colors, but they are not mutually exclusive. So if you want more than that, you combine the colors: For example, if you have the text Style_1_4_5 and want it a different color from the 5 built-in style colors, what you could do is highlight that word, apply style 1; it should have remained highlighted, so then you could also apply style 4; it should remain highlighted, so then you could also apply style 5. After applying the 3 different styles, the color combination will be different from any of the 5 builtin styles – so it will not be color1, or color4, or color5, but a mathematical combination of the three colors. Using combinations of 1 or more of the 5 builtin styles, you can create 2⁵-1=31 different colors, all 31 of which are shown in Claudia’s post.
Also, Claudia left the Community years ago (and I still miss her insights and helpful contributions), so she will not come back to reply to your post.