Reversed Type has different guidelines than Regular Type, and should be made bolder or thicker when possible.
Some things to keep in mind when using Reversed Type:
Try to use font with thicker stems and strokes, minimum 8pt font size or 0.5pt line-weight. (See: What does pt (point) mean?)
Sans Serif fonts work best for Reverse Type. We do not recommend to use script fonts as they will likely be unreadable, and do not recommend to use Reverse Type for large blocks of text, since this can be tiring for eyes to read.
For more information see: Reverse Type