Chelpark appears to be avoiding the internet, as I can find references to them but nothing by them. They’re an Indian maker of pens and related objects, and their output includes ink. I’m not absolutely blown away by what I’ve tried, but it seems a fairly innocuous ink and can be had at bargain prices. It is very much in the pattern of Quink, from the shape of the bottle to the inclusion of a pen-cleaning (and likely slightly toxic) additive. This additive goes under the delirious name of “Cleen-X”. Update: I discover some great time after writing the previous that Chelpark was initially a Parker affiliate– the associations are not mere emulation but approved features (at one time, anyway, as the bond was severed in the late 1960s).
Examples (note– I’ve not calibrated my scanner, so these are mere approximations of the true colour):
Emerald Green: I objected to the paleness of this ink aloud when making the sample image, and my wife pointed out that emeralds are in fact rather pale and disappointing in real life. This is, therefore, a very true and successful colour.