I think it was produced with duotone offset printing. The yellow was specified 
in place of some highlights.
Paul
On Sep 7, 2011, at 6:35 PM, Ann Sanfedele wrote:

> Another postcard from my friends family.. calling all chemists
> 
> This is a very glossy photo - anyone know anything about this kind of tinting 
> back then? I can't figure it out... not a traditional tinting where the whole 
> photo would have been colored.. or was it once and
> lost other colors? Is the yellow. thre is sime "silvering out" but it
> sint'very noticiable because of the background exposure.
> 
> anyone?
> 
> http://annsan.smugmug.com/Other/Things-Im-selling-directly-
> Not/6280507_84bVv7/1/1468163517_sJnbMK3/Large
> 
> ann
> 
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