Hi, thank you for contacting JustAnswer.com. My name is Russell. I honor your request to cancel the question, but feel that you deserve some sort of response anyway.
I am not sure of the solution to the problem as stated. Doubtless you found one with some trying and thought.
Cartridges that are alien will be refused by the Brother printer owing to their lacking the proper recognition signals as sensed by the printer's circuitry.
You might need to seek out and purchase ink that *is* for this printer, but is *not* toxic. There may be such a product.
The other ink might be recycled unused, or donated charitably to be used in a state or jurisdiction or context where it will be both usable and useful.
Thank you for asking your question here at JustAnswer.com.