they've now stopped adding the dye for health reasons.
Nothing to do with the fact its cheaper not to add a green dye then? I suspect this is probably the main reason, i mean why put it in there if it does nothing for the product. It probably is toxic, but they save money by not having to have a storage area for it, no separate handling facility and they have to provide less PPE to their staff.
Once its been in there for 6k or so it's all black anyway