Most brands available are now producing cruelty-free, vegan-friendly pigments.
The shelf life of a bottle of permanent makeup pigment is 3 years closed, 1 year after being opened. (Unless otherwise stated by the manufacturer) Expired pigments should never be used.
Low quality pigments:
The use of low quality pigments results in uneven fading, discolouration including orange or bluish/grey, and colour migration.