Brown/unbleached vs white cardboard
tldr: are these white cardboard boxes appropriate bedding material?
I regularly receive packages made of cardboard boxes with a white outer surface. One side of the boxes have blue print. I can imagine that the blue print is ink and I should not add the 'blue cardboard' to the worm bin, but the white surfaces of the cardboard I'm not entirely sure about. It has the look and feel of bleached paper and the surface has a matte finish.
Is this white cardboard suitable, unsuitable or not ideal (but the benefits of the brown cardboard underneath outweigh the potentially or slightly harmful white paper/cardboard surfaces)?
I have a bunch of regular brown cardboard boxes as well, which is definitely the preferred bedding material, but I just want to check whether I should yeet the white boxes straight into the local paper recyling bin, or I can still turn it into some decent worm turds.
For context, 4 months ago I made a simple worm bin of 4 plastic boxes (45x25x10 cm). 3 of the 4 trays are in use now, where the bottom 2 trays just leave for the worms to finish the last bits cardboard and hope to harvest in a month or 2. I plan now to use the 4th box as the inoculating tray. Initially I started with 250g worms and the population seems to have at least doubled in size, possibly tripled. They seem to like the place.