An experiment with surprising results. I was trying to get my blown out sky to have some detail in, so i had to do some burning. Not being to happy with just a grey sky i tried sepia toning which worked for the building but i felt that the bleach removed most of my burning. I ended up using some selenium to darken the sepia but still couldn't get the detail into the sky. Found some old blue toner that had been left out & i feared it wouldn't work. I used it to tone the sky, luckily it didn't tone the rest of the print..