I bought for the first time non-HP cartridges for my printer. After removing the Schutzklips the cartridge half the ink is running me over the hand; it lies also not soon remove. When inserting the second cartridge, I then wore gloves and kept them in removing the Schutzklips with the open side facing downwards. This is the ink that is probably leaked transport requirements, and run smoothly in the Schutzklip. After short wiping the cartridge I could use them easily and clean and also the print quality like it so far super!
So if you open the cartridge correctly, that's no problem. The price of course is unbeatable! And this one likes to take some work when inserted into buying.