Touched the Checking Cloth and Found Blood on the Finger
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Question
Shalom and blessings, My wife checked the cloth during one of the seven clean days (not in the first three days), and the cloth appeared clean, but before she checked the cloth, she ran her finger over it and felt that her finger got dirty. She wiped her finger with a tissue and saw a small red spot on it, the size of a lentil. What is her status? Thank you very much.
Answer
Shalom and blessings,
If the finger was clean, and after touching the cloth she found blood on it, she is impure. Since the blood certainly came from the checking cloth, it does not matter that the stain is smaller than a lentil, because blood found on a checking cloth renders impure in any amount.
However, if the finger was not clean, and it can be assumed that the blood was already on the finger beforehand, she does not become impure.
Source
Shulchan Aruch, Siman 190