Orange for Hooker Chem cars ?

[propmeup1]

I need to paint some Hooker Chem cars but I'm not sure what shade of orange to go with. Each model manufacture seems to use a different shade of orange.  I looked on line for photos of real cars but haven't found any.   Any ideas please.   Need to get them close to correct as possible.  Thank you,
KTB

[bbussey]

It depends on the era. Early and mid 20th century, they were a deep reddish orange. Late 20th century, the Atlas color is a good representation.

[muktown128]

I suspect the color change would be related to the elimination of heavy metal pigments containing elements like lead and chrome.  This is why CAT yellow changed from a brighter yellow to the more mustardy yellow oxide color seen today. 

[propmeup1]

I mentioned all of that to the client. If you don't have the actual color then pretty much most would work. You can look at 50 photos and each one will be a different shade.  I just want to get it close but I enjoy all the input here, thank you,
Keith

[Lemosteam]

Maybe this could help:

https://www.therailwire.net/forum/index.php?topic=37774.0