Fig. 8
From: Artificial coloration of ancient agate beads: a mineralogical study
SEM image of (a) red black zone of D, (b) white zone of D, (c) black zone of B, (d) translucent zone zone of B, (e) white zone of B, (f) white zone of B, (g) dark red zone of C, (h) white zone of C, (i) bottom right show the red and left upper zone show the scattered white zone of A, (j) the inserted rectangle zone of A in (i) with higher magnification