How long does it take you to post process an image? Of that time, what amount of that time do you spend understanding your intention with the photograph?
But when the colors are not right, the desire for the food in your photo is lost. This post talks about adjusting and correcting the colors in your photographs.
Today those chemical baths and acids have been replaced by softwares like Lightroom, Aperture, GIMP and other post processing applications.