l1orI didn't really use this ink but i have one and opened it and 3 months later nothing seems changed to me.(The color i have is blue and i didn't like it)
Most ink can be open and use for a long time as long as you keep the cap properly screwed on ,maybe some will dry out a bit but i haven't experience that.
But in general you want to use your ink as quick as possible as the ink will perform better,but if you don't care you can even add water(not that you should,only if you really don't care)
I am not sure i am 100% correct but that's what i have experienced with my inks.
I am not sure i am 100% correct but that's what i have experienced with my inks.