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#744452 Fri Feb 28 2020 01:41 PM
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Why were some of the visible pump glass cylinders blue? Seems like they are more desirable so there must have been less of them?

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There was a post on Oldgas some time ago. You first question came up and it was that blue cylinder kept fuel cooler

Someone correct me if I'm wrong.. done a search and couldn't find it..


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Theory was that the sun leached the strength from the gasoline. Cobalt was added to the glass to give it a blue color and act as sunshade. There were some deep purple cylinders out there too. I have one in a Fry Speedway. Paul www.severngaspumps.com

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i think the sun turned the glass blue.we used to find mod t headlight linzes that had turned blue.they would not have made them way. charley

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Was some magnesium or flint in some of the glass back then and the sun would turn those cylinders a blue tint depending how much was in the glass.


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Thank you Paul ,
your theory makes most sense to me.i always liked the blue tint cylinders.

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I don't know how sun would leach gasoline. In fact gas expands in the heat, so they never filled the cylinders to the top with gas when it was hot.
Most of the time cylinders were empty and gas drained back to the tank.


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