I had some ground clove in a plastic container and when i came back to it some time later it seemed… https://t.co/GJOOo9WLkl
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Cloves and star anise contain certain essential oils (eugenol and anethole) that are chemically very similar to #6 (polystyrene). Because of this chemical similarity, these spices are able to melt the polystyrene.
A better choice would be to store the spices in plastics #2 (high-density polyethylene) or #5 (polypropylene).
The best choice would be to store these in glass containers not plastic.
per Google search using parameters "ground cloves melt plastic".
Best of luck.