tracing paper
charcoal
pencils: use hard and soft lead
gray or black pastels (optional)
or any other media that works and is achromatic (without color)
find textured surfaces place your tracing paper on top and make a rubbing with any of the above media. The rubbing does not to be large -- 4" x 3" at the largest.
Cut any size rectangle or square from each rubbing. These could be 2" x 3" or 1.5" x 2", etc, but once you decide on a size be somewhat consistent.
Create a value ladder or scale in you sketch book with the cut rubbings. You can make this ladder any size. It can run from the top of a page to the bottom or run from one page horizontal to the other.
Below are some examples of Frottage:
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| (here you see the paper put over a textured surface) |
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