The greenish blue color observed in some amber from the Dominican Republic and Indonesia is actually fluorescence stimulated by ultraviolet (UV) light. A previous study described the color as iridescence over a yellow background, but it is in fact a surface fluorescence. Since this amber can be considered a long-wavelength pass filter with a half-pass wavelength at about 530 nm in its spectral transmittance, it does not transmit either UV or short-wave visible light. As this material completely absorbs light in the UV range and strongly absorbs light in the short-wave visible range, the stimulated blue color is confined exclusively to the surface. The amber from this study also showed the Usambara effect, the phenomenon in which color varies with the path length of light through a sample.
Amber is thought to help absorb negative energy and to release bright, soothing energy, helping to calm nerves and enliven disposition like a mental sunny day. The different colors of amber are often used on the chakras with corresponding colors to facilitate opening and cleansing. Yellow amber has been used traditionally by natural healers to improve memory, increase mental flexibility and create balanced decision-making.Amber has also been used, historically, as a talisman for courage and self-confidence, and was thought to bring good luck to warriors in battle. In some cultures, amber symbolizes the renewal of marriage vows and is used to assure promises. It is worn by elders as a symbol of their endurance and wisdom.
We take picture under sunlight, and normal light.