Few weeks ago I was working on absolute black granite sign. 16'x6'x1 outside next to the busy road. It looked very rusty but it wasn't rust. I think it was deposits from nearby oak trees, cleaners didn't work so I ended up using pinch of 5x on white pad. It cleaned all in no time. Just a thought
I would recommend contacting Fred Hueston he has several labs he
is works with . if the granite is rusting many granites have natural iron
deposits in them and over time will oxide. Other time I have seen polished
granite take on a rusty look for a contractor that has honed the granite and
then tried to crystallize the granite before it totally dried.
From:rosen.stuart@gmail.com [mailto:rosen.stuart@gmail.com] On Behalf Of stuart
rosen Sent: Friday, June 01, 2012 7:39 AM To: Restoration and Maintenance Subject: [sccpartners] Testing Stone
I have a customer that wants to have his granite tested. It
is on the outside of a building and rusting.
Does anyone know a lab that will test the stone and identify
its components.
The stone is a granite that is quarried in Israel.