LePera's Reagent could be an possible solution for you :D

Le Pera etchant can distinguish martensite, ferrite, (tempered martensite / bainite) with color.

But, your specimen (Martensite + bainite) can be really hard to separate two phases in image. Usually bainite co-exists with tempered martensite unless you did a heat treatment to make two phases of bainite and prismatic martensite.

In this case(B + TM), due to the microstructural similarity, tempered martensite and bainite is really difficult to distinguish. Then, you should use proper additional technique.