12 HP 4200 toner refilling

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.. and fill in the toner. After filling, cover the hole with masking tape and shake the cartridge. If you are skilled, you can carry out the filling in a large plastic bag, and that will lessen the chance of toner flying everywhere. If you get toner on your clothes, wash off with soap and COLD WATER. Never use hot water, as that will fuse the toner into the fabric.

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