Red Star is 100% compatible ink and the properties such as specific gravity, viscosity, surface tension, & color tone are same as original. Just open the lid of the cartridge using a sharp devise like a screw driver/knife, take ink in the syringe, just fill it and paste the lid. If ink is not coming out properly after refilling then put the cartridge in the suction holder and suck one or two ml ink using the suction syringe. Only cartridge in a good condition can give good prints after refilling.
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