Small drawback: the closure. Unlike competing products, the cartridges are not sealed with a plastic part, but with an adhesive tape.
At the point where you should remove the (marked by arrow), this is no longer remove tape after a short storage time.
It has been connected to the transparent plastic of the cartridge.
Never mind about the opening with the sponge where the ink comes out, the tape is indeed in aluminum over, and can be pulled off.
But: The color like splashing out. So rather go with gloves ink. Or delegate this task to someone who just wears no fine yarn;)