Ceramic Glass Cooktop & Pyrex

Can a Pyrex double boiler be used in direct contact with a ceramic glass cooktop without the use of a wire diffuser?
TIA     
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wrote:

Mrs. used to do that all the time. We were never told that wire diffuser was reuquired.
Neither the cooktop, nor the pyrex, seemed to have suffered from this abuse. NOTE: hate both for cooking.
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