Disappearing ink fountain pen cartridges

I was asked by members of SFPL to do a video of writing with a new novelty that I purchased from taobao recently, disappearing ink cartridges. Originally, these cartridges are meant to be used with indented copybooks that is becoming popular in China, which was why I bought them in the first place, but I'm sure our beloved members will find ways to get into trouble with them. Be safe people, don't get caught..

The cartridges come in pockets of 30, under 10 Singapore dollars but shipping is a killer. I shipped two packets on top of the copybooks I purchased, doubt I'll be buying them solo.

The pen used in the really poor quality video is a Daiso (4th generation) pen, the cartridge is an international short. As you can see from the video, the ink starts to fade almost immediately, it will probably not be the best thing to open bad checks with, but not too bad for practicing writing. I'll play with it a little more and update this post if I discover anything else worth noting about this cartridge.

ESS registrar's ink unboxing

10 days after ordering from E.S.S. Stationery Supplies:

The cardboard box was squashed but no biggie

Bottle was in good order.

Loaded it into a Parker 45 with 14k nib. The choice of pen is so that, if the ink clogs the pen, I can easily take it apart after soaking. 14k nib to prevent rusting from the inks acidity. 

And yes Jeffrey, your vital is already.

A quick test on poor quality paper shows minimum bleed through and no feathering, my original purpose for the ink was for use on poor quality papers, it seems to fulfill that nicely.