How do i know if my tank glass is low iron?

[sealife]

I had a custom made tank a while ago and local store is no longer there.
Apparently is was supposed to be a high end tank, but i did not know much about low iron or starfire glass back then. If i put pics up here of the end of the glass tank, could you tell from the pics? Pics in the links:

View image: 20160603 225245 001

View image: 20160603 224814

View image: 20160603 225322

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[Hunter73]

It's really hard to tell from just pictures, but in my opinion it looks like low Iron glass.


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[sealife]

Thank you.
I dont know how i should take a photo of the glass tank. I though this was they best way.

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[Mr tap water]

In my opinion it looks like low in iron or what they would call optic white which is more expensive to buy .
The more Iron it has The greener it will look.


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