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It should be fine if it is still green. Hercules powders used to come in a square metal can with a round lid. They were very well-built cans, sealing the powder against light, moisture, and air. Hercules switched over to a square metalized cardboard can in the early 1970s, then to a round metalized cardboard can with a pull spout in the early 1980s, then to plastic bottles as they became Alliant Powders.
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