I cut a very hot hard boiled egg and found a blood spot inside. Does that make the knife not kosher?

 

Question continued:

If yes, can I kasher the knife? How would I kasher it – it has a plastic handle? Its a knife that is usually used to cut onions and other sharp foods

 

Answer:

If it was a regular commercially produced egg, the knife remains kosher and there’s no need to kasher it.

 

Sources:

See here:

Halacha2go #468: Checking Eggs

 

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