According to OU kosher certifying agency, “one may make utensils (e.g. spoons, ladles) from the bones of non-kosher animals and there is no concern, since bones do not impart taste. In our situation, the bones are filters and do not become part of the sugar, and there is no kashrus concern …”
See article at https://oukosher.org/blog/articles/a-closer-look-at-sugar-the-sugar-refining-process/
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