If you post in the COMPOSE mode, even though the print appears bold, when it's published, it will be white and not bold.
If you decide to change the default color, make sure you BOLD your words and test it out when you PUBLISH it.
I have a new computer at work, and sometimes I can't read what some people have written.
I recently added some colors for my Mardi Gras haiku. The yellow, green, and purple were not "true to life" but I adjusted them so that others could read it. It took a few attempts before I could read it.