Easy to use. Filling syringes just got easier, just clean with water and they're ready for the next filling. Use a drill slightly larger than the syringe so it fits in easily. Insert the syringe into the hole and into something that feels like foam and start filling it up slowly, stopping when it starts gushing out of the hole. Aspirate excess ink with a syringe and wipe excess ink off the cartridge with a paper towel and replace the label/sticker. You have to drill a hole for each color on the color cartridge. Use a toothpick to identify which color goes where by sticking it in the foam inside the cartridge. The toothpick should be colored when you pull it out. If not, you might have to push it a little. Or, if not, try the other 2 holes, if you can identify 2 of the 3 then you're done. Remember this ink is water based but it will get bloody messy if you put it on clothes etc so cover your work area. The ink bottles I received had drip or squirt tips installed. I carefully removed them so I can easily fill my syringes. I put them back in the bottle before putting the caps on for storage. Hope that helps!
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