Kosher Witness for Inspection

I don't have a 'witness for inspection' at home, what can I use for a purity check?

There is no obligation to purchase inspection witnesses; you can definitely use existing fabric at home. However, there are several conditions. A. The fabric must be completely white. B. The fabric should be large enough to wrap around the finger and not fall during the inspection. C. The fabric should be made of an absorbent material, such as linen or cotton. D. The fabric should have already been washed, not new from production, as it absorbs better.

Shulchan Aruch Yoreh De'ah 196:6

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