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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