UV Ink Experiment

One advantage of a drawing machine working with coordinates is that it does not need to see what it draws.

Under the blue light


I bought a fountain pen with a refillable cartridge, and some UV ink.


The UV ink is invisible to the naked eye but the pen did leave trails on the paper.


6 and 1/2 hour job

Someone in Brazil drew this on Mandalagaba years ago and I’ve used it to stress test plotters since :). I wish I could get in touch to show them.

The Four Sisters

I’ve gotten pretty good at producing these.

The best part is always watching them being drawn