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For over a century, light echoes have been observed around variable stars andtransients. The discovery of centuries-old light echoes from supernovae in theLarge Magellanic Cloud has allowed the spectroscopic characterization of theseevents using modern instrumentation, even in the complete absence of any visualrecord of those events. Here we review the pivotal role the Blanco 4m telescopeplayed in these discoveries.

Light Echoes of Ancient Transients with the Blanco CTIO 4m Telescope