What Causes the Colour Phenomena of Blue Amber?

Dominican blue amber.

The greenish blue shade noticed in some amber from the Dominican Republic and Indonesia is definitely fluorescence stimulated by ultraviolet (UV) mild. 

Amber is fossilized tree resin used for jewellery, ornament, drugs, and fragrance. Specimens with inclusions of bugs and crops are of nice scientific significance and extremely esteemed by collectors.

Amber is often yellow to brown, and a few specimens show pink to brownish purple or reddish brown colours. Blue amber is uncommon, discovered primarily within the Dominican Republic with some manufacturing from Indonesia and Mexico.


Blue amber is amber exhibiting a uncommon blue coloration. It’s mostly discovered within the amber mines within the mountain ranges round Santiago, Dominican Republic, but in addition within the japanese elements of the Dominican Republic. Though little recognized resulting from its rarity, it has been round because the discovery of Dominican amber.

Causes of coloration

When pure mild strikes blue amber on a white floor, the sunshine passes proper by way of, and is refracted by the white floor. The result’s the slight blue hue of blue amber. When the identical pure mild strikes the amber on a black floor, the sunshine isn’t refracted by the black floor, however by the precise amber. Hydrocarbons within the blue amber shift the solar’s ultraviolet mild down in frequency, ensuing within the glow of blue amber.
 

Dominican blue amber.

This impact is simply potential in some specimens of Dominican amber class, in some Mexican ambers from Chiapas and a few ambers from Indonesia. Some other amber (akin to Baltic amber) won’t show this phenomenon, as a result of its unique resin isn’t from the Hymenaea protera tree.


The polycyclic fragrant hydrocarbons, produced by way of a pyrolytic course of that’s initiated by way of irradiation, chill out to their floor state, take up excessive-power ultraviolet photons and re-emit them as decrease-power seen photons, in line with the absorbance curve of the actual fluorophore.

Lately, optical absorption, fluorescence and time-resolved fluorescence measurements in Dominican ambers have been reported. These research present that the “blue” selection reveals an intense fluorescence emission within the seen wavelength area, between 430 and 530 nm, with spectral options typical of fragrant hydrocarbons. Quite the opposite, the Dominican “purple” and “yellow” amber varieties have a a lot weaker and featureless emission, though nonetheless do have a sure fluorescence. The method in blue amber is surprisingly just like phosphor.

Though there are a number of theories concerning the origin of Dominican blue amber, there’s a nice chance that it owes its existence to elements similar to anthracene because of ‘incomplete combustion’ as a result of forest fires among the many extinct species Hymenaea protera timber about 25 to forty million years in the past.

Vittorio Bellani and Enrico Giulotto on the College of Pavia, Italy studied a number of amber specimens via optical absorption, fluorescence spectroscopy, and time-resolved fluorescence measurements. The ensuing spectral evaluation revealed that the spectra of the hydrocarbons are very comparable in form to these of diluted options of anthracene, perylene, and tetracene, and recommend that the fluorescent hydrocarbon liable for the blueness is almost definitely perylene.

References:
The Caribbean Approach
Color Phenomena of Blue Amber
Blue amber


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