Bostik blu tack blu stick glue sticks for paper bulk packs bostik 30813315 bostik blu stick is a blue coloured solid glue stick that turns clear when it dries allowing you to see exactly where you are applying the glueit is perfect for use in schools as it carries the ce mark and has been designed to meet and exceed stringent ec child safety legislationbostik blu stick is suitable for bonding most paper materials including card crepe and tissue paper foil cellophane and photographs