What standard do I use to verify Yellowness Index Performance?
Posted on by Ken Phillips
There are no physical liquid standards specifically designed to verify the Yellowness Index of liquid samples over time. Yellowness Index is defined as a mathematical function such that a perfect clear of 100% transmission, typically represented by the transmission cell filled with DI water, will have a YI value of 0. However, a good workaround solution […]
How do I use the round Small Volume (4 ml) 10 mm Transmittance Cell?
Posted on by Ken Phillips
HunterLab’s round cell (A13-1011-613) is a practical small volume cell for transmittance color and haze measurements. Ken PhillipsMr. Philips has spent the last 30 years in product development and management, technical sales, marketing, and business development in several industries. Today, he is the global market development manager for HunterLab, focused on understanding customer needs, providing appropriate […]
How can I upgrade EasyMatch QC-ER software on an existing computer?
Posted on by Ken Phillips
EasyMatch QC-ER is a 21 CFR Part 11 compliant version of HunterLab’s EasyMatch QC software for electronic records. Here is how to successfully upgrade to a newer version on the same computer. Ken PhillipsMr. Philips has spent the last 30 years in product development and management, technical sales, marketing, and business development in several industries. […]
References for Hazen Color Scale
Posted on by Ken Phillips
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 Ken Phillips
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 […]
How does EasyMatch QC-ER software comply with FDA 21 CFR Part 11?
Posted on by Ken Phillips
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. Ken PhillipsMr. Philips has spent the last 30 years in product development and management, technical sales, marketing, and business development in several […]
History of the APHA/Pt-Co/Hazen Color Scale
Posted on by Ken Phillips
“APHA” stands for American Public Health Association Color Scale, the organization responsible for the original definition and implementation of this visual color scale as a standard method for rating water quality. Ken PhillipsMr. Philips has spent the last 30 years in product development and management, technical sales, marketing, and business development in several industries. Today, […]