I need to export a file to CMYK for printing, but whenever I change the Document Color Mode it completely changes the blending mode effects of the raindrops pictured below. I've tried flattening the transparency, rasterizing the raindrops, and nothing preserves the original effect seen below.
Raindrops as intended in RGB mode:
Raindrops as soon as I convert to CMYK:
The raindrops are comprised of a path set to Color Dodge, and a Gradient Mesh set to Multiply:
Further to Monika's correct response: Most effects work best in RGB mode and are not as effective on CMYK objects. But, even if you stay in RGB, know that when you are dealing with out-of-gamut colors, as some of your brighter blue areas are, you may still see unexpected results when those colors are converted to CMYK. You should toggle on/off View > Proof Colors to see what your colors will change to in your CMYK space.