This started as an experiment taking shots of the flames in my woodburner. The individual shots were all a bit low on number & volume of flames, so I thought I'd combine a few together to bulk them out. I found that using layer blending mode screen combined them OK. Then I experimented with other blending modes & generally playing around - this gave some quite nice colours.
Just an playful experiment, but comments invited.
johnlw, marshfam19, BlueRoom