I find the sole of my shoes marks my customers' tiles easily. Difficult to cut to as they're 1/4 inch wide, and sometimes awkward to remove (the marks not the shoes)
Mine tend to fall in me pocket at work
If you want a precision mark the best is the pointy end of a diamond escapement file, puts a very nice line in the glaze (want one ? I've got a shed load of 'em).
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