| 摘要 |
Methods and systems that provide privacy of signatures on envelopes containing ballots are provided. The envelope for returning ballots includes a flap with a window that aligns with a signature area on the envelope. The window appears opaque under normal lighting conditions, but appears transparent when illuminated with light within a predetermined band of wavelengths. To read the signature, light having wavelength within the predetermined band can be directed onto the window, thereby rendering the window transparent and the signature visible.
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