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This happens when you use 100-K-Black in CMYK-files. It's no problem in print, only on the screen.
You cannot remove this. It's gone when you use rich black, multiply blend mode or if you overprint the object and turn on overprint mode. But these might cause other issues when printing your work.
so would you recommend that i no longer use 100% black in my drawings, and rather a very dark grey?
No, of course not. You should use exactly the color you want to get printed.As I said, this gray border is a preview issue. In print trapping will take care of adjacent colors.
If you're doing screen design you should use color mode RGB.
i am doing screen editing, is there any way to convert my image to RGB? im new to illustrator so i dont really understand the colour modes yet
edit: i found out how to change from cmyk to rgb but my black lines now turn light brown when i use these dark colours to fill.
overprint mode is off
edit 2: it seems i changed the colour myself at some point. going to fix it now.
thanks for the help and marked as answered
You should create an RGB file from beginning. There are different colors in your palettes then.
If you convert later, you should convert colors afterwards. Use "Live color" for that: Edit > Edit Colors > Recolor Art
Then above all convert black to RGB 000.