Photogr. [UNDER-1 10 b.] Insufficient exposure to light.
1873. E. Spon, Workshop Receipts, Ser. I. 255. If the negative is deficient in density,… it is the result of under-exposure.
1892. Photogr. Ann., II. 90. Rodinal … gives much softer negative than quinol, especially in cases of under-exposure.
