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A photograph showing detail of the blue ground which had been harrowed twice.

A photograph of the type of engine used in cultivating the 14 inche layer of blue ground on Bultfontein floor. A harrow is shown in the background and a similar engine in the distance.

A photograph of a 5 mile field of blue ground.

A photograph over one of the diamond fields of Du Toit's Pan diamond mine. The rock or "blue dirt" is at first in rather large chunks. This field is three miles across and covered to a depth of 18 inches with blue ground.

The blue gladiolis, very abundant here. It has two red spots on the laterals. [Shantz travel journal, Mar. 17, 1920]

Digital illustration for Blue Lives Don't Exist article.