Chemical Treatment Effects of Blue, Yellow and Green Colors with Heating Methods on Agates of Cheshme Shoor Area, Qom, Iran

Abstract

The Cheshme Shoor area is located in northeast of Qom which is a part of central Iran geo-structural zone. The rocks of the area are mainly volcanic rocks that include Eocene acidic tuffs and ignimbrites. Different types of agate, jasper and amethyst formed as secondary cavity filling deposits in variety of colors and shapes in the area. In this paper, chemical treatments by different chemicals with heating methods in 15 different procedures have been conducted on one agate sample of the study area which has been divided into smaller pieces by milling. Dyeing with these methods has been done in blue, yellow and green colors. Excellent results have been achieved in 9 processes, significant but not expected results have been illustrated in 4 processes and 2 processes have been represented no changes. Produced colors have had a natural and light color which makes them more desirable to the consumers but totally these dyeing processes illustrate that concentration of the solution is effective in coloring and solutions with more concentrations produce stronger color.

Surprise eggs, the miracle of nature: almus agates (Tokat - Turki̇ye)

“…Treatment methods are used in pale-colored agates that are not considered to be visually sufficient. Therefore, color treatments are made in agates by methods such as dyeing and heat treatment (Hajalilou and Vosug 2008;yazdi, et. al.…”

Standard formulations for cold dyeing routes of agates: An energy-saving option for artisanal and small-scale producers

“…Heating stages are usually conducted in wood or gas-fired ovens. A specific discussion on local agate dyeing techniques is presented here, but a comprehensive review of methods to enhance the appearance and color of gemstones can be found in Nassau (1984;1994) while Tubino and Sampaio (2000) and Yazdi et al (2016) present specific information about chemical treatments of agates.…”