Charles filter (CHELSEACOLOURFILTER)
Principle: A color filter is a special optical lens that only transmits red and partially yellow-green light, but absorbs other colors.
How to use: Use a strong light source to fix the gemstone, and the filter is used to observe the eye.
Introduction: Charles filter (CHELSEACOLOURFILTER) is also known as emerald color filter (EMERALDFILTER) or beryl mirror (BERYLOSCOP). At present, there are many types of color filters for gemstone identification, but the performance is best sold by the British Union Gem Society. The most common jade is fake (also known as ochre), coating, etc. Among them, dyed jade is also called C. Because it has the same beautiful color as true jade, it is often deceptively fake.
Dyeing jade usually has methods such as dyeing green and radiant coloring. Among them, the dyeing of the dye is a jade raw material or a finished product which is light or white in color, and the gap is expanded by adding a high temperature method. Immediately soak in the green dye solution, or apply high pressure to press the dye solution into the gap. Most of the green dyes used are inorganic chromium salts. The jadeite dyed with chrome salt will turn pink to brownish red under the Charles filter, while green jadeite will be green or grayish green. That is to say, all the green jade that turns red under the green mirror of Charles are “fake goods”. They are either dyed or not jade at all, using other raw materials. For example, water calcium aluminum garnet is posing.
Overview of the fourth generation of fiber micro Charles filters:
Filter component: A new generation of fiber optic micro-glass filter, compared to three generations of color filters, four generations of color filters have higher resolution and durability.
Chelsea filter: A color filter originally made to identify emeralds, so it is also called "emerald filter". Because of its wide use, it is sometimes referred to as "color filter" in some literatures in China.
A generation of Charles filters are made by sandwiching a special dark yellow-green film in a protective glass sheet and housed in a round plastic case that can be transferred in and out. Identification of the dyeing effect is also very obvious, but the disadvantage is that such a film will gradually remove its own dark yellow-green color after long-term use, after a period of use, it will lose the optical properties of the filter color, and some friends who use the color filter I don't know if the filter has been discolored, and I still use the decolorized filter, I will mistake the dyed jade as a natural purchase. Therefore, the first generation of Charles filter was gradually eliminated in the 80s, and the second generation of Charles filter appeared.
The second-generation Charles filter is made up of two glass-coated glass, which has a longer life span than the first generation, but in general, it will gradually decolorize during long-term oxidation and heat.
With the development and advancement of science, some gemological associations in the UK have developed and developed a special colored glass, which is a special color filter glass composed of an orange special lens and a blue special lens. It can detect the dyeing phenomenon of various green and blue gemstones, especially for the dyed Hetian jade fake skin color and the fake red blood clot of antique jade. This is the new generation of Charles filter, named: the third generation of Charles filter (Chelsea Colour Filter III)
The third-generation Charles filter, because of its special lens, is made of glass that never fades, so we don't have to worry about one day seeing the stained jade, and the special glass itself deepens the filter. The color effect can also be seen for some very light stains.
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