Review on 🖨️ E-Z Ink (TM) Compatible Toner Cartridge Replacement for Brother TN227 TN227BK TN223BK TN-227 TN223 for MFC-L3750CDW HL-L3210CW HL-L3290CD HL-L3230CDW MFC-L3710CW Printer Tray - Pack of 2 Black Cartridges by Fred Massingill

When we first installed them, pages that were completely black were bleeding. Since that's the only thing that has changed in our setup, I have to assume it's the toner. However, there were no problems with further printing and mixing of color and black. Not only do I print in black, my husband does and I haven't heard from him again. So for a professional setup, this might not be the best option.