| 摘要 |
1,175,747. Intensification of metal particle images. PHILIPS GLOEILAMPEN FABRIEKEN N.V. Feb. 16, 1967 [Feb. 19, 1966], No.7527/67. Heading G2C. A layer of metal particles distributed in or on a support in the form of a latent or visible image is intensified so as to form a visible image of semi-conductive material by contacting the layer with an aqueous alkaline solution containing a salt of lead or cadmium, together with thiourea and/or selenourea and/or as N-substituted derivative of thiourea or selenourea egallyl thiourea. |
