Review on 🖨️ CISinks Universal Toner Refill for Brother TN420 TN450 TN540 TN660 TN720: Exceptional Toner Powder Solution by Jeffrey Mosqueda

The print quality is of course NOT professional. I have not been able to print copies of my resume in this ink. There is either something wrong with the ink, or I refilled my starter toner cartridge with a lower capacity than a normal cartridge. My printed pages have had small specks/blobs of ink all over the page for a long time (hundreds of pages filled mostly with text and rarely with small images). The spots were gray and looked like small worms (about 1/2 centimeter or 1/4 inch) scattered across the page. Also, there were TONS of stains all over the page, as if the page had been overcoated with a gray primer! Finally, thin lines were concentrated in certain parts of the page. Now that the toner is mostly gone, the small worm-like spots and concentrated fine lines are mostly gone, but the spots continue to cover the entire page, just not as dark as they used to be when the cartridge was refilled. What frustrates me the most is not knowing if the problem was caused by bad ink or if I overfilled the cartridge.