I learned that if something can be flicked off of a bedika cloth, its not a problem. Im in 7 nekiyum. A few days ago, I did a bedika which had a hair or lint looking line. Out of curiosity, and without thinking carefully I flicked it off. The rest of the bedika was clear (or a Rav said it was fine, I dont remember). Is this something I should be concerned about at this point.
In most instances, if it isn’t absorbed in the cloth it isn’t blood.