Dear Lee Ann,
it sounds as if the photograph of your grandfather may be a cyanotype,
which is an old process that used potassium ferricyanide and ferric
ammonium citrate with water. Often the mixture was applied to heavy
paper/card stocks and when printed/processed results in blue toned
images. This would be my first guess without seeing the actual photo,
it could however be an image that was soaked in a blue toner.
Hope this helps.
best,
kim v. smith
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