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We describe a simple experimental apparatus which allows the quantitative study of the classical analog of a quantum eraser. The apparatus consists of a laser diode, a thin wire, two polarizers providing the which-wayinformation, and a third polarizer which erases that information. The experimental results are analyzed with the aid of a digital camera and the Trackerapplication, and are compared with a novel classical computation of the interference patterns, which is presented as well.

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Chemically reduced graphite oxide with strongly improved shape anisotropy was prepared by Staudenmaier oxidation of high surface area graphite, followed by hydrazine monohydrate reduction. Selection of the starting graphite was effected on the basis of the highest shape anisotropy of the crystallites. The overall oxidation–reduction procedure preserves the in-plane order of graphite and dramatically increases the out-of-plane disorder, which becomes similar to that one of carbon black. In particular, the overall procedure led to aggregates of few piled structural layers (D⊥≈ 2 nm) with increased periodicity perpendicular to the layers (from 0.339 nm up to 0.362 nm) and with high shape (D∥/D⊥≈ 13) and strain (ε⊥/ε∥≈ 15) anisotropy.