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Residue from such candles would be a problem for kashrus. However, as long as there is no connected 'liquid stream' from the source candle to the dishes, you can simple scrub off any residue and t...
Answer
#1: Initial revision
Residue from such candles would be a problem for kashrus. However, as long as there is no connected 'liquid stream' from the source candle to the dishes, you can simple scrub off any residue and the dish would be considered kosher. Source: [Yoreh Deah 92:9](https://www.sefaria.org/Shulchan_Arukh%2C_Yoreh_De'ah.92.9?lang=bi&with=all&lang2=he) As far as how much residue, anything practically discernible would be a problem. If it could be felt, seen, or otherwise recognized, it would need to be removed.