Sometimes, it helps to put colors on your symbols so that your audiences can grasp equations or definitions at a glance, especally when you are giving presentations with lots of them.
A complete solution is given here.
I’ll just give you an example which goes like
$$\color{orange} A = \textcolor{blue}{B} \mathbin{\textcolor{red}{-}} \textcolor{green}{C}$$
And that gets compiled to be
$$\color{orange} A = \textcolor{blue}{B} \mathbin{\textcolor{red}{-}} \textcolor{green}{C}.$$
A Remark 🔗
What’s good about this solution is that it depends only on $\LaTeX$ itself. That is, any platform that supports $\LaTeX$ (plus some basic packages) will support this solution.
For instance, I typically use
- Kenote to make slides,
- $\KaTeX$ to write blogs and
- iA Writer to jot down notes (or logs).
And all of them support this solution.