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"pickling vinegar" that's a stronger solution than regular vinegar
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You can also get 'vinegar concentrate' that is even stronger - and diluted to make 'home vinegar' - that is basically pure acetic acid diluted with water.

But you certainly don't want 'fuming' or 100% acetic acid, it's REALLY nasty... and 'industrial'... made from a waste byproduct of sertain industries.

I have before me "Concentrated Harvey's Essence of Imitation Vinegar - Table use - 1 part to 5 parts water - pickling use - add a little less water. A Qld product."