Here is a shot I did with 2 green and 1 purple vial. The camera was on a tripod, f8 and 15 sec exposure. The room was pitch dark, except for a quick on/off with a desk lamp.
From the latest round of prototypes, this one is for sale now on my blog
It's a cool little thing -a 2-cord slider/bead or a creative element in paracord projects. Can be used to break up / bling up paracord bracelets and lanyards.