Blu-Tack is a reusable putty-like pressure-sensitive adhesive often used for attaching posters to walls. The original version was blue, but a white version is now available and it is generally mid grey in the United Kingdom. It is based on a formulation consisting of synthetic rubber, polymers, oil and inorganic fillers.
Blu-Tack is a trademark of Australian company Bostik Findley, a subsidiary of French mineral oil company Total S.A.
Similar products from other manufacturers include "Buddies" (pink), and "Pritt-Tack".
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