Medium to bright streaks of yellow/green not always presentīright green streaks in certain portions of heartwood Medium to bright streaks of green not always presentįaint uniform yellow/green not always presentįaint to medium green streaks (not present in sapwood) Medium uniform yellow/gold not always presentįaint to medium yellow/green streaks not always presentįaint to medium streaks of yellow/green not always presentįaint yellow/green streaks not always present Medium to bright streaks of green surrounding dark areas in heartwood Here is a list of woods that exhibit some level of fluorescent properties when exposed to a black light:įaint to medium yellow-green dependent on speciesįaint to medium uniform blue not always apparent in wood, but vivid in ethanol extractįaint to medium yellow/green not always present Species that are shown to produce a fluorescent response may still vary from piece to piece in the color and intensity of the fluorescence.While some species will give a strong fluorescent response, many others will only be faintly fluorescent, while the majority of species will exhibit no fluorescence at all.The most common colors of fluorescence are green and yellow, but some woods can fluoresce orange, pink, red, etc.Be careful not to mistake simple reflections or illumination of the wood surface for fluorescence: the wood should literally glow.Turn out all other lights for the clearest detection of fluorescence.Freshly sand/expose the wood grain before testing: this can be critical in detecting fluorescence in some woods.Buy the brightest (highest wattage) blacklight available.The process of detecting fluorescence in wood samples need not be intimidating or limited to the scientific community-blacklight bulbs are available in many hardware stores for only a few dollars and can be used in standard lamp sockets. (These bulbs should never be confused with germicidal ultraviolet bulbs such as those used in UV sterilizers, which emit UVB or UVC light, which can pose serious health hazards.)Įven though the process of detecting fluorescence is very simple, a few suggestions will help to maximize the effect and make the identification process as reliable as possible: But one way to easily distinguish the two is by observing them under a blacklight Black Locust will emit a strong yellow-green glow, while Mulberry will be non-reactive. One of the best examples of fluorescence is found in Black Locust (Robinia pseudoacacia), which is very similar to Mulberry (Morus spp.) in both appearance and weight. This phenomenon is known as fluorescence, and certain woods can be distinguished by the presence or absence of their fluorescent qualities. While certain woods can appear basically identical to one another under normal lighting conditions, when exposed to certain wavelengths-such as those found in blacklights, (which are mostly invisible to the naked eye)-the wood will absorb and emit light in a different (visible) wavelength.
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