Blogs
Do you have a source for a Sample Conditioning Cabinet for Heat and Humidity?
Posted on by Ganesh Ramanathan
FAQ: “… I just need to find a way to better condition the samples for consistency. I can get some pretty consistent results on my own, but once it’s in a general QC lab, it’s going to need some standardization.” Ganesh Ramanathan
Conformance summary of how HunterLab sphere instruments measure ASTM D1003 Transmission Haze
Posted on by Ganesh Ramanathan
Ganesh Ramanathan
Instrument Geometry – Directional 45°/0° or Diffuse d/8° Sphere?
Posted on by Ganesh Ramanathan
The geometry of an instrument is the relative position of the light source, sample plane and detector, and is one of the 6 key parameters that define a color measurement. There are two general categories of instrument geometries – directional 45°/0°(or 45°/0°) and diffuse d/8° sphere. To tell the difference between directional and diffuse instrument geometries, look […]
What Tomato Tiles are available as Hitch standards?
Posted on by Ganesh Ramanathan
There are two Tomato Tiles in general use – the European BCR-400 Tomato Tile and the American USDA/UCDavis Tomato Tile. Both are “tomato red” in color but visually different. Ganesh Ramanathan
How do I measure a very dark chromatic sample in Transmittance?
Posted on by Ganesh Ramanathan
FAQ: “How do I measure a very chromatic and dark sample in transmittance? Is there a smaller path length cell that I can use for my dark chromatic sample? It currently does not transmit much signal through my 10mm cell.” Yes, HunterLab does offer a smaller 2mm path length top loading cell for very dark […]
What scale is used to measure the color of waste water?
Posted on by Ganesh Ramanathan
“True Color”, “Apparent Color”, “Adams-Nickerson”, “Biodegradable Colour” are all the same name for what we call ADMI Color (American Dye Manufacturer’s Institute). Ganesh Ramanathan
References for Hazen Color Scale
Posted on by Ganesh Ramanathan
The original references were written by Allen Hazen, a chemist who first defined APHA/Pt-Co/Hazen color scale for the evaluation of water quality on behalf of the American Public Health Association: Hazen, A. A new color standard for natural waters, American Chemist Journal (14:300), 1892. Hazen, A. The measurement of the colors of natural waters, American […]
How do I measure “clear and colorless” Surfactants?
Posted on by Ganesh Ramanathan
FAQ: “We are in touch with a pharmaceutical company which is looking for a spectrophotometer to measure the color and appearance of cationic surfactants. Can you provide any information on this topic?” Surfactants reduce the surface tension of a liquid as in the use of a dish detergent; the interfacial tensions between two liquids such as in the case of […]
What is the correct light level in lux for a light booth?
Posted on by Ganesh Ramanathan
FAQ: “I want to measure the lux level for a light box we are using to evaluate the color of garments. I would like to know, how many light boxes are required for a room. One light box has four D65 tube rods. My question, Is there any standard value of lux which we need […]
How does EasyMatch QC-ER software comply with FDA 21 CFR Part 11?
Posted on by Ganesh Ramanathan
There are several parts to the 21 CFR Part 11 documents with a good overview of 21 CFR Part 11 at the US FDA website. Part C is the key section concerned with electronic records retention. Ganesh Ramanathan
Where can Liquid Gardner Color Standards be ordered?
Posted on by Ganesh Ramanathan
Ganesh Ramanathan