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4. Photochemical priming
4.1 One-photon priming
Single-photon absorption of a photochemical initiator, used in "classical" stereolithography, follows Beer-Lambert's law. Locally, for a primer concentration c, the absorbed light intensity is proportional to the product c. 10 (–ε.c.x) where x is the distance in the cuvette from the light entry window, ε the molar or molecular extinction coefficient (figure 18 ).
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Photochemical priming
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