Vesicular pictures - converted to light-absorbing pictures by blowing with pigment dust

摘要

Closed gas bubbles in vesicular images are exchanged with a solid picture material by blowing warm pigment dust onto picture, opt. after conversion of vesicular picture to an open-pored picture and partic. after marking the pores with tensides, so that the dust accumulates at the faster-softening, consequently stickier, bubble-rich picture-sites. Uses depend on pigment dust, and include reflex-reflecting pictures for signal-code tables (spherical glass particles), xerography.