Both “hydro” coming from Greek origins for water and “hygro” coming from the Greek “hygrós” for wet or moist, tend to be used in two terms for the same optical phenomena.
FAQ: “We have a scientist here who is looking at films containing small bubbles and attempting to do measure them by measuring Haze% on a HunterLab spectrophotometer. I suspect her problem in obtaining numbers that “make sense” from what you get from just eyeballing the samples (and trying to look through them at the outlines of a object behind the film to gage the amount of regular transmittance) is that her samples have Haze% > 30 %, which means that a spectrophotometer (or even a haze meter) isn’t the appropriate tool to use for the analysis.
How is transmission haze measured at levels > 30%?”
One application that often comes up is measuring the color of clean liquids such as the fragrance sample seen above. This liquid fragrances is clear and looks almost like water. Fragrances such as this are often added to cleaning supplies, air fresheners, or other consumer products. One of the problems that this type of sample can experience is that the chemistry of the liquid fragrance solution can go bad and it will start to visually yellow. This is a concern of the manufacture because if the liquid fragrance yellows it cannot be added to the end product. Continue reading
HunterLab has instrument and sample handling devices to meet almost any customer needs. One such need that we are able to meet is the measurement of molded plastic parts, such as the one pictured above. These plastic parts are actually covers for a stud finder tool. The nature of these parts presents a few difficulties for color measurement. Continue reading
Often times it can be helpful to change the standardization interval on instruments to correspond with shift changes or other events that might be more convenient. When the instrument reaches the end of this standardization interval it will prompt the user to re-standardize the instrument before moving forward with measurements. Continue reading
FAQ: “Do you know of a test lab for DDG Color of Dried Distillers Grain?
DDG stands for ‘Dried Distillers Grain”. While its origins are based on evaluation of the residual protein content of wheat and corn for cattle feed that had been used in the distillation of whiskey, bourbon and spirits, it has moved on from distillers to serve the same purpose for the biofuels industry. Continue reading
important parameters. Hot peppers, used as relishes, pickled or ground into a fine powder for use as spices, derive their pungency from the compound capsaicin (8-methyl-N-vanillyl-6-enamide), a substance characterized by acrid and burning taste, that is located in the internal partitions of the fruit. First isolated in 1876, capsaicin stimulates gastric secretions and, if used in excess, causes inflammation. It is a tasteless, odorless white crystalline substance. Its level varies widely in capsicum peppers, from less than 0.05% in the mildly pungent types to as high as 1.3% in the hottest chilies. The pungency level is usually represented in Scoville heat values. Pungency levels vary in the same variety, by geographical region, and in maturity levels. Volatile oil content is low in all capscicums. The pigment responsible for the color in paprikas is capxanthin, a carotenoid. Other carotenoids present are capsorubin, zeaxanthin, lutein, kryptoxanthin and alpha and beta-carotene. Continue reading
In fresh red tomatoes, Lycopene occurs as the major pigment (Lycopersicon esculentum, 85 – 90%). Other pigments present are beta-carotene (10- 15%) and small quantities of about 10 other varieties of carotenoids. The outer skin of the tomato contains the highest concentration of lycopene.
To improve functionality and ease of use, HunterLab has made some small improvements in the design of our classic sample cup. Continue reading