Whats the best way to get that dirty yellow look seen on most stuff on Hoth?

[SaltyStarCat]

Hey, I'm trying to make a diorama of Hoth and I'm not as the title says I'm not sure what the best method is for getting that yellowed look that stuff like rebel turrets have in the battle. Currently, my main materials are just 3d printer PLA and theoretically I could just yellow my white models using the sun but theres got to be a more efficient way to go about this. Thanks for the help

 

[Psab keel]

Watered down acyrlic paints?

 

[Mottrex]

Diluted coffee
Tea..

 

[Moviefreak]

Try Adam Savage’s technique that he used while working at ILM.

 

[Mara Jade's Father]

Oops. Sorry. I thought you were trying to get rid of the yellow.