What specific type of filter did Ivanovsky use to separate the infectious agent from infected tobacco leaf extract?

Answer

A Chamberland filter made of unglazed porcelain

Ivanovsky used a Chamberland filter, described as a highly porous, candle-shaped filter made of unglazed porcelain, which was thought to be impermeable to all known bacteria in 1892.

What specific type of filter did Ivanovsky use to separate the infectious agent from infected tobacco leaf extract?
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