I use cartomizers with my egos. Regretfully the trusted vendor (cheapest price for decent cartos - good at fixing problems - fast shipping etc) I buy from only sales cartos that are filter colored
. I like to vape more then one flavor during the workday and I have tried various ways to to tell them apart - none worked.(For example I bought a set of 12 different colors of Sharpie permanent color markers to color code them - only to find that 'permanent' meant less then 60 seconds when exposed to e-liquid
) - I can't be the only one with this problem. Has anyone found a solution?

