Can you use newspaper that has colored ink?
Using Newspaper to Prevent Weeds Between Rows of Vegetables.
Certified GKH Gardening Expert
These inks are, usually, safe. I wouldn't worry too much. This type of paper is unbleached, which is the real problem. This is a good application of newspaper in the garden. This article has more information: https://www.gardeningknowhow.com/plant-problems/weeds/how-to-kill-grass-naturally-kill-unwanted-grass-in-your-yard.htm