I am using texify.com to generate images of equations, so that I can put them in emails. I am trying to insert a colored equation, using the following code:
{\color{green} dy} = {\color{red} \frac{dy}{dx}} {\color{green} dx}
However, the image produced is entirely green, including the equals sign and fraction bar. Am I coding this incorrectly, or does it just not work on the website?
(Of course, if there are better ways to put math equations into emails - I use gmail primarily - I am all ears!)

