The basics Bluebird FX Concentrated Inks Pen - A handy way to work on-set! The benefits These Concentrated Inks are creamy, have fantastic coverage, and are long lasting and dry with a natural looking sheen. Can also be used for palette refills. The uses Cover tattoos or do quick casualty make-up right out of your stand-by kit. Simply squeeze and paint! Handy for tattoo cover and casualty.  The bottom line Concentrated Inks in a fabulous tube form that has a little brush at the end to make it easier for those quick touch ups.