Oblique Light
Light from the side, falling at a shallow angle, which reveals the surface structure of an object through contrasts of light and shade. Oblique light is used especially to inspect embossing stamps, intaglio printing, latent images and mechanical erasures.
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Light from the side, falling at a shallow angle, which reveals the surface structure of an object through contrasts of light and shade. Oblique light is used especially to inspect embossing stamps, intaglio printing, latent images and mechanical erasures.
Source : Click Here
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