Tattoo healed with different colours

Why would bright blue ink turn green after healing? I had bright baby blue ink in my tattoo but after it healed its an awful green. There was no issues with healing, no infection, almost no scabbing.. But the blue is green and even the bright playful red which was almost pink is a blood red..

Crap quality ink....always buy from a reputable seller, not from Amazon or Ebay
It would also help if you posted a photo and also ink brand and type of skin (caucasion, black etc)

Possibility: The other issue you may have is staining….rubbing subsequent colours across your open blue skin when wiping. This normally ‘heals out’ but I’ve definitely seen it stay in and muddy up other colours.