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InstaMash is packaged in a white box with blue highlights. A tag-line toward the bottom of the box states that InstaMash comes "With Real Dig-In Flavor!" The "insta" part of the name most likely indicates that the contents are powdered and requires added water to swell, similar to instant mashed potatoes.
Irradiated InstaMash is exactly the same as regular InstaMash, but has been exposed to the high levels of radiation found at Camp Searchlight.
Preserved InstaMash is a pre-War version of regular InstaMash and therefore delivers no radiation damage.