Most of us have a preference for the colour of ink that we use. Enzo Ferrari famously used violet ink, & my teachers at school seemed to favour red.
Increasingly, though, many organisations are requiring staff & customers to use black ink particularly for forms or other documents. The reason often given is that black ink is easier to photocopy. Curious then that most of Europe use blue ink with seemingly no difficulty.
All Something Different quotes for pens state the available ink colours, but t is worth noting that many pens are available with only one ink colour option.
Some manufacturers offer special order options for a different ink colour - but this can add to normal delivery times.