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Mystery blue powder from the 1920s for polishing crystal?

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What is this mystery substance? In an episode of Upstairs, Downstairs, Rose and Daisy are cleaning crystals from the chandelier. Rose explains that "...then you give the pieces a wipe-over with this powder blue before the final polish and that gives the glass an extra sparkle."Screengrab here. It's at about 23:15 from this episode, season 5/episode 5, if Netflix is helpful. Apparently it's also good for mirrors? I'm not Googling correctly and/or Mrs. Beeton doesn't cover this.

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