Re: Chama oil facility signs -- reques

Hi. The Friends sign crew was provided a couple of photos in response to our query last fall but we're still researching the Chama oil loading facility’s historical signage in preparation for work this summer and we’re hoping somebody can help us advance our research.

In question are two metal safety signs, one at each end, that have this wording:

DANGER
NO SMOKING
KEEP LIGHTS
AND FIRE AWAY

We have photos from as long ago as the 1930s and as recently as the 1960s that show the signs with a dark (variously appearing to be black, gray or gray-blue) background and white lettering.
We have more recent photos showing the signs with a silver background and dark lettering as long ago as 2006.
What we’re trying to narrow down is when between the late 1960s and mid-2000s the paint scheme changed from dark background/white lettering to silver background/dark lettering. Anybody have any photos showing the signs since the late 1960s and before 2006?

Paul
Friends sign crew