Method of simulating natural desert varnish on a suitable rock s

Details Method of simulating natural desert varnish on a suitable rock s Method of simulating natural desert varnish on a suitable rock s

1986-02-07

1988-02-16

Childs, Sadie L.

Coating processes

Coating pavement or the earth

427140, 427267, 427301, 427343, 4274191, B05C 116

Patent

active

047254513

ABSTRACT:
The disclosure teaches a method of simulating natural desert varnish (that requires at least decades to produce by nature) within a few days. The method is broadly exemplified by the steps of applying a strong base followed by application of a soluble iron or manganese salt. Optionally, sodium hypochlorite may be applied as an additional step after the metallic salt application to speed up the process. The resulting product is difficult to distinguish from the natural varnish.

REFERENCES:
Engel et al, "Chemical Data on Desert Varnish", Bull. Geol. Soc. Amer., vol. 69, No. 5, pp. 487-518. (1968).
Hem, "Deposition and Solution of Manganese Oxides", U.S. Geol. Survey Water Supply, Paper 1667-B, pp. B1-B41, (1963).
Krauskopf, "Separation of Manganese from Iron in Sedimentary Processes", Geochem. Cosmochim. Acta, vol. 12, pp. 61-84, (1957).
Hunt, "Desert Varnish", Science, vol. 120, pp. 183-184, (1954).

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