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Yeah, from what I remember, Zephyr was demonstrating blueing.
It was a bit late in the afternoon and there where beers, so not entirely sure;)

It is a Vulfix I bought a couple years back, just for fun.
In the ad it stated clearly that it was a display-piece and not for actual use as a shaving brush.
But it works:)

Here's a vid where I...

I will never forget the first time I saw one of those.
It blew my mind that anyone would think that such a small brush would make any lather at all.
But it did so splendidly!

Here's a pic of...