A paper blotter and a cotton blotter absorb fragrance differently. Both are different from skin. If you have been using only one of these surfaces to evaluate formulas, you have been working with a partial picture.
VARIABLE A | STANDARD PAPER BLOTTER (PERFUME TEST STRIP)
Standard perfume blotter paper is absorbent but inert — it has no chemical activity of its own. Aromatic compounds absorb into the cellulose fibre and evaporate from the surface at rates determined by their own volatility. The paper blotter gives a clean structural read: top, heart, and base depart in predictable sequence because there is no body heat to accelerate the process and no chemistry to interact with the formula. Paper blotters are the correct tool for evaluating formula structure in isolation.
VARIABLE B | COTTON FABRIC STRIP
Cotton has a tighter fibre structure than blotter paper, which absorbs more formula per square centimetre and holds it more securely in the fibre matrix. On cotton, evaporation is slower — top note compounds persist longer than on paper. However, cotton fibres can interact with certain synthetic musks, slightly modifying the base note character on prolonged contact. Cotton blotters are useful for evaluating longevity (how long does the base remain detectable?) but less useful for evaluating structure (how cleanly does Act 1 transition to Act 2?) because the retained top note material extends Act 1 artificially.

RESULT
Paper blotter: best for structural evaluation — cleanest read of the three-tier sequence. Cotton fabric: best for longevity evaluation — retains base note compounds for extended assessment. Skin: the only correct surface for personal chemistry evaluation — how this formula interacts with your body. Use all three for a complete assessment: paper blotter for structure, cotton for longevity, skin for the personalised result. Using only paper blotters, as most people do, gives you structure without longevity or personal chemistry data.
WHAT TO DO INSTEAD
Apply one spray of the same EDP to a paper blotter, a small cotton strip (cut from a cotton round or cotton fabric), and the inner wrist simultaneously. Evaluate all three at 5 minutes, 45 minutes, and 3 hours. Document what is perceptible at each surface at each time. The comparison gives you the most complete single-session evaluation possible — more information than any single surface alone.