I have a tikz node \node[] {blah};
and I want to set the color of half the text, such as "ah" to a different color without having to create a new node and try to make everything stick together through positioning. (My text is more complicated, it involves formulas where I want to color some things in it to specify additional information).

\mathcolorfrom Colored symbols. – Peter Grill Sep 11 '19 at 08:43