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References for Hazen Color Scale

How do I measure “clear and colorless” Surfactants?

What is the correct light level in lux for a light booth?

How does EasyMatch QC-ER software comply with FDA 21 CFR Part 11?

Where can Liquid Gardner Color Standards be ordered?

APHA = Pt-Co = Hazen = PCU = Platinum Cobalt Color

APHA/Pt-Co/Hazen vs Gardner color scales: What’s the difference?

Where does one find the EP (European Pharmacopoeia) Liquid Color Matching Standards?

Do HunterLab sphere instruments conform to ASTM D1003?

Is there an Internet Site for converting and displaying color values?

Optimal inter-instrument agreement and communication of color values

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Blogs

References for Hazen Color Scale

Posted on January 23, 2013 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 […]

Posted in Chemical, Color and Appearance Theory, Pharmaceuticals, Plastic Tagged APHA, Hazen, liquid color scale, Platinum Cobalt, Pt-Co, PtCo Leave a comment

How do I measure “clear and colorless” Surfactants?

Posted on November 26, 2012 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 […]

Posted in Chemical, Color and Appearance Theory, Pharmaceuticals, UltraScan PRO, UltraScan VIS Tagged APHA, cell path length, haze, Pt-Co, total transmission, transmission cell, transmission haze, vsual standards, Y Total Leave a comment

What is the correct light level in lux for a light booth?

Posted on November 18, 2012 by Ken Phillips

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 […]

Posted in Color and Appearance Theory Tagged ligh box, lux, Munsell 2 Comments

How does EasyMatch QC-ER software comply with FDA 21 CFR Part 11?

Posted on November 5, 2012 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 […]

Posted in Color and Appearance Theory, EasyMatch QC-ER, Pharmaceuticals Tagged electronic records, electronic signatures, EZMQC-ER, FDA 21 CFR Part 11 ERES, IQ OQ PQ, IQOQPQ, pharma Leave a comment

Where can Liquid Gardner Color Standards be ordered?

Posted on October 29, 2012 by Ken Phillips

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 solutions and education, and helping to solve customer color challenges across these industries and cultures.

Posted in Chemical, Color and Appearance Theory, EasyMatch QC, EasyMatch QC-ER, Plastic Tagged Gardner, liquid color standards, vsual standards Leave a comment

APHA = Pt-Co = Hazen = PCU = Platinum Cobalt Color

Posted on October 23, 2012 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, […]

Posted in Chemical, Color and Appearance Theory, Pharmaceuticals, Plastic Tagged APHA, cell path length, Hazen, PCU, Platinum Cobalt, Pt-Co, PtCo, transmission cell Leave a comment

APHA/Pt-Co/Hazen vs Gardner color scales: What’s the difference?

Posted on October 22, 2012 by Ken Phillips

The APHA/Pt-Co/Hazen and Gardner visual color scales were both originally based on liquid chloroplatinate color standards but have different history and intended use. 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 […]

Posted in Chemical, Color and Appearance Theory, Pharmaceuticals, Plastic, UltraScan PRO, UltraScan VIS Tagged APHA, Gardner, Hazen, Platinum Cobalt, Pt-Co, PtCo 3 Comments

Where does one find the EP (European Pharmacopoeia) Liquid Color Matching Standards?

Posted on October 17, 2012 by Ken Phillips

 EP – European Pharmacopoeia Color is a visual liquid color scale used primarily in the pharmaceutical industry. It consists of 3 primary color standard solutions (yellow, red and blue) mixed with hydrochloric acid to make 5 standard color solutions – B (brown), BY (brownish-yellow), Y (yellow), GY (greenish-yellow) and R (red). Ken PhillipsMr. Philips has […]

Posted in Color and Appearance Theory, EasyMatch QC, EasyMatch QC-ER, Pharmaceuticals, UltraScan PRO, UltraScan VIS Tagged EP, European Pharmacopoeia Color Standards, pharma Leave a comment

Do HunterLab sphere instruments conform to ASTM D1003?

Posted on October 12, 2012 by Ken Phillips

Yes, but note there are two different approved instrument geometries cited in the ASTM 1003 method. 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 […]

Posted in Color and Appearance Theory, EasyMatch QC, EasyMatch QC-ER, Instruments and Software Tagged haze, scattering, total transmission, transmission haze, Y Diffuse, Y Total Leave a comment

Is there an Internet Site for converting and displaying color values?

Posted on September 20, 2012 by Ken Phillips

FAQ: “… Was wondering – do you know of a web site or application where  if CIELAB values were entered, the corresponding color would be displayed? Can I also convert from one color scale to another?” Ken PhillipsMr. Philips has spent the last 30 years in product development and management, technical sales, marketing, and business […]

Posted in Color and Appearance Theory, EasyMatch QC, EasyMatch QC-ER Tagged appearance characteristics, color calculator, color display, color render, hand enter, internet color calculator, manually enter color values, QC software Leave a comment

Optimal inter-instrument agreement and communication of color values

Posted on September 17, 2012 by Ken Phillips

To communicate color values effectively, completely specify the 6 parameters of your measurement method and verify that your color measurement is repeatable. These are the key factors to ensure inter-instrument agreement. The best inter-instrument agreement in color measurement at multiple locations occurs when a product is measured with the same instrument model from the same […]

Posted in Color and Appearance Theory Tagged ASTM, color communication, color measurement, color scales, communications, inter-instrument agreement, ISO, JIS, MDL mean detection limit, measurement method, measurement parameters, physical measurement, whiteness index Leave a comment
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