I'm trying to print a double sided invitation that has a mainly black background but the design also includes other colours. I've set up the file as a pdf in illustrator and when I print the front is great but the back has weird grey patches and streaks as if there isn't enough toner printing onto it. I'm new to printing my own stuff and have only just invested in the printer so I know I'm doing something wrong, just don't know what. I've tried altering the true black setting and changing just to 'k' black but its still the same. Thank you If you can help at all.
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