I let all my animal hair brushes swim in the sink filled with warm water while I'm taking a shower.Do you dip your brush all the way till that ring in hot water?
The boar absorbs water and in that area the bristles swelling might have stressed out the ring. I read this long back on another forum that boars must be dropped in to the hot water only around 3/4ths of the way.
Your logic makes sense, maybe I shouldn't... But that's a question I'll ask myself as soon as I have a broken brush.
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