I worked my way through the katakana (yikes - I'm rusty!) on the Japanese Pilot site's Petit 1 page and am kind of sad about the limited number of colours the ink cartridges are now available in. No more violet, no more dark green, no more turquoise (takoizu), brown, wine red...
The only colours listed now are:
Guess it's a good thing I have that ink syringe kit!
I have no affiliation with Pilot - I just love their pens.