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Determination of dust extinction curves of distant galaxies is becoming increasingly important to be able to accurately calibrate extragalactic data such as the SNIa cosmology surveys. As extragalactic extinction curves are hard to come by, Galactic type of dust extinction is frequently assumed. It is however not safe to assume that distant galaxies have the same extinction curve as that of the Galaxy as the shape of the extinction curve depends on the dust composition and grain size distribution. I will give an overview of the current state of the field - focusing on extinction curves obtained using gravitationally lensed quasars. Finally I will discuss future prospects for extinction curve studies with lensed quasars in proposed future surveys such as the LSST or SNAP. |