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They are BAD. A coffee cup of water up to the handle bristles-down, a bit before. A heaping tablespoon of Oxyclean tossed in and then the brush, bristles down.
Let it fizz until it stops...

Seems that Anthrax thing did them in for a long time. Even as it was over.

The shape seems similar, like boar?. Just looking at old adverts. Could be some modern advantages?

Well....JMO....I had rather push a horsehair brush than drive a synthetic. Lots closer to the Earth.
It's a cool brush! After a few Oxyclean baths to get the stank out...

Because they exist for some apparent reason. Have for a few centurys.

I have a Vie Long. Love it. Really scritchy. Works well. Great for something different on occasion, not as nice as other things but really makes you appreciate them! ;)
If mine got gone, I would...