OfficeMax Bostik Blu-Tack Colour can be used the same as Blu-Tack, but its vibrant colours make it the perfect modelling material. Excellent moulding qualities resist slump. Will not shrink, dry out or harden and can be used over and over again. Can be used to create three-dimensional models and two-dimensional images to decorate windows or walls. 75 GSM pack.