Today morning i went out to try how they work. I tried them on my digital camera this time, so that i know how the result looks before i try it on film.
Here is the original shot:
And the results:
For the red and blue filters i used permanent markers, and they surely look darker and smoother. The pink one is the highlighter. All the others are made just with regular Stabilo markers, they left lots of bubbles, and the color on the images was not so smooth. But they all are fun to play with. Gonna be using them with film from now on!