Try storing canned tuna in the refrigerator

If you're purchasing tuna packed in water, this method is guaranteed to work. Since many of the other ingredients for tuna salad—like mayonnaise, relish, and celery—are also kept in the refrigerator, the only item that would remain at room temperature is the unrefrigerated tuna. However, if you follow this tip and store it in the fridge, everything will be chilled, and you’ll just need to let the flavors blend together.
There is one important note regarding this tuna refrigeration tip: avoid refrigerating tuna packed in oil. When oil is chilled, it solidifies, changing from liquid to solid. If you store tuna in oil in the refrigerator, you'll have to let it sit out for a bit to return the oil to its liquid form. While you could prepare the salad with the oil in its solid state, it typically looks less appetizing.
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