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1. An ink cartridge comprising a liquid ink, an extraction system for the liquid ink and a container for the liquid ink, the container having a non zero water vapor transmission rate, the liquid ink occupying a first region of the container, the ink cartridge further comprising a second liquid, the second liquid occupying a second region of the container, whereby the first and the second region are separated, and whereby the extraction system is in communication with the first region but is not in communication with the second region.
2. An ink cartridge according to claim 1, whereby the first and the second region are separated by a wall.
3. An ink cartridge according to claim 1, whereby the first and the second region are formed of a porous material.
4. An ink cartridge comprising a container, a porous material and a liquid ink, the porous material being located inside the container, the liquid ink occupying a first region of the porous material, the ink cartridge further comprising a second liquid, the second liquid occupying a second region of the porous material, whereby a third region of the porous material is free of the liquid ink and free of the second liquid, the third region separating the first and the second region from each other.
5. An ink cartridge according to claim 4, whereby the second liquid is colorless.
6. An ink cartridge according to any of claims 4 or 5, whereby the porous material has a first side and an opposite second side, whereby the first region includes part of the first side and the second region includes part of the second side.
7. An ink cartridge according to claim 4, whereby the second region has a volume larger than the first region.
8. An ink cartridge according to claim 4, whereby the second liquid is more volatile than or at least as volatile as the liquid ink at ambient temperature.
9. An ink cartridge according to claim 4, whereby the porous material is an integral piece of porous material.
10. An ink cartridge according to claim 4, whereby the container material has a water vapor transfer rate of at least 0.1 mg per 24 hours per 6.45 cm2 at 38 degrees Celsius and 90% RH and of less than 1 g per 24 hours per 6.45 cm2 at 38 degrees Celsius and 90% RH.
14. A method of extracting liquid from an ink cartridge according to any of claim 1 or 4, whereby the liquid is extracted out of the cartridge from the first region only.
15. A used ink cartridge comprising traces of a liquid ink, an extraction system and a container, the container having a non zero water vapor transmission rate, the traces of the liquid ink occupying a first region of the container, the ink cartridge further comprising a second liquid, the second liquid occupying a second region of the container, whereby the first and the second region are separated, whereby the extraction system is in communication with the first region but is not in communication with the second region.
16. A used cartridge according to claim 15, whereby the second liquid is present as a trace.
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