platinum carbon desk pen - is it really for the carbon ink

I managed to get my hands on a platinum carbon desk pen, which is advertised to be able to use carbon-based ink. Truth be told, I have used the hero 234 carbon-based black ink in pilot penmanship, hero pens, jinhao pens without any problems, so I am a little suspicious if the improvement is the feed or the ink. Anyway, let's just take a closer look at the platinum desk pen's feed, which it says will prevent clogging due to the carbon.

So, comparing a platinum cool to a platinum carbon desk pen. Structurally they look similar....



The nib, doesn't look much of a difference too. Except the 4 legs. its a point to note.


The feed of the carbon version do have a bigger and deeper feed, and the fins are made correctly. The gap is well within the equation's limits, and thus there should NOT be blockages for the pigments and should wash out easily. Do note this is for platinum carbon ink only; other pigments may still be blocked.

The upper part of the feed has a distinctive feature. 2 drains for the carbon feed. larger and deeper too.

 
Nothing distinctive on the underside here....