Bloomsbury tells name on Potion Book Cover

[Tonks]

Hi everyone. I wrote to Bloomburg and they actually answered my e-
mail. I cut and pasted their e-mail here:
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Many thanks for contacting us. The author's name is Libatius Borage; 
hope that clears everything up for you.

Best wishes,
Bloomsbury.com Customer Services

www.bloomsbury.com 
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So this should clear up all the speculation as to the name of the 
author of the potions book. 

Tonks_op
Happy Auror Detective