Shamrock Scientific Pre-Printed / Write On Label Auxiliary Label Blue Date Opened _____ / Exp. Date _____ / Expiration Date Control Black Quality Control Label 3/4 X 1-1/2 Inch (647857_RL) 1/RLSince many items' perishability depend on when they're opened, use these labels to record when you opened them. Labels have two blanks: one for date opened and another for expiration date. Roll holds 500 black text on blue background labels.