I think whink is hydrofluoric acid-it will etch granite and be damn near impossible to remove even after grinding. 
If you do try to remove it you can create a nice dip-


On Wed, Apr 20, 2016 at 4:32 PM, <daci6537@comcast.net> wrote:


From: daci6537@comcast.net
To: "Stone and Tile PROS Technical Support" <sccpartners@stoneandtilepros.com>
Sent: Saturday, April 16, 2016 12:18:21 PM
Subject: White stain on granite


Has anyone every seen granite do this?  Customer spilled rust remover on granite countertop. And if so what was the remedy?

 
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Stu Rosen
201-446-1200

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