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. Continue reading
FAQ: “Our site requires us to standardize the instrument every 4 hours. Is there any way to change this in the EasyMatch QC software?”
The EasyMatch QC software prompts the user to Standardize the instrument ever 8 hours, this is the default setting when the software is installed. If your company requires the instrument to be standardized at a different interval, this can be changed in the EasyMatch QC software.
FAQ: “I would like to be able to read my product in Reflectance Specular Included (RSIN) mode and Reflectance Specular Excluded (RSEX) mode. Is this possible to do without manually switching modes every time?”
Yes, the EasyMatch QC software has a function called Multi Mode. Multi Mode is set up so the instrument can standardize and read in two separate but similar modes. Continue reading
These APHA/Pt-Co/Hazen liquid color standards were originally developed as references for visual APHA/Pt-Co/Hazen Color comparison to samples. Their role with instrumental APHA/Pt-Co/Hazen Color measurement is primarily as a performance qualification check of the instrument prior to measuring liquid product samples, or to validate the instrumental-to-visual correlation.
HunterLab instruments have their own internal diagnostic standards to verify instrument performance. Measurement verification on these liquid color standards serves as an application diagnostic, affirming that the instrument has been configured correctly and is reading APHA/Pt-Co/Hazen color in the range of the samples closely and consistently over time.
There are many suppliers of APHA/Pt-Co/Hazen liquid color standards. Just make sure that their liquid color standards conform to ASTM D1209. Also some APHA/Pt-Co/Hazen color standards come in a small volumes sealed in glass intended for visual comparison purposes rather than instrumental measurement.
Typically a client orders a Platinum Cobalt 500 Color Standard and mixes it down to intermediate levels such as an APHA/Pt-Co/Hazen 30 that are close to the product color.
While there are other industry test methods that reference the Platinum Cobalt 500 Color Standard Solution, also known as APHA/Pt-Co/Hazen Color Standard, preparation of the liquid standard is best defined in ASTM D1209 Standard Test Method for Color of Clear Liquids (Platinum Cobalt Scale). Instruction for preparing intermediate APHA/Pt-Co/Hazen standards below 500 by dilution is found in ASTM D1209 Table 1. This method also provides advice on how best to perform visual comparisons to these liquid color standards.
Sources for Liquid APHA/Pt-Co/Hazen Color Standards
Ricca Chemical Company, Arlington, TX 76094 USA +817-461-5601 www.riccachemical.com can be ordered through Fisher Scientific www.fishersci.com with worldwide distribution (search under Analytical Reagents for “Color Standard APHA/Hazen” conforming to ASTM D1209).
RICCA manufactures the liquid APHA/Pt-Co/Hazen 500 Color Standard, as will also prepare the intermediate standards, and certify them. They also sell a liquid APHA/Pt-Co/Hazen 1000 Color Standard for rare cases where the product color exceeds 500.
Fluka sells the 500 Color Standard along with sets (2 ml and 10ml) for 20 different intermediate APHA/Pt-Co/Hazen standards, sealed in vials and intended for visual comparison.
Paragon is a European supplier of APHA/Pt-Co/Hazen color standards (fixed 5, 10. 15, 30, 50, 100, 500 color standards only with certification). Please note that Paragon offers an APHA/Pt-Co/Hazen color standard that represents 0. As this is just certified distilled water, purchase is not recommended.
Reagecon is a European supplier of APHA/Pt-Co/Hazen, Gardner, Saybolt and ASTM D1500 liquid color standards in accordance with ASTM D1209, ASTM D6166 and ASTM D6045 methods.
Hach bought Dr. Lange (Germany) and with it got their LICO color measurement instruments that include measuring APHA/Pt-Co/Hazen and Gardner Color. Dr. Lange also had a side business of supplying liquid color standards for instrument performance qualification. Hach UK has picked this business up in Europe.
The ADDISTA Colour Set of 6 certified standard colour solutions for LICO (LZM282 consists of 3×50 ml APHA/Pt-Co/Hazen liquid color standards (levels of 20, 100, 200) and 3×50 ml Gardner liquid color standards (levels of 2, 5, 8).
Our EasyMatch QC software has a built-in 10 mm correlation for measuring both APHA/Pt-Co/Hazen and Gardner Color simultaneously on the same sample with the 10 mm cell path length filled with distilled water being APHA/Pt-Co/Hazen and Gardner = 0, representing no color.
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 is to use a very stable APHA/Pt-Co liquid standard in the yellowness range of your product as an application diagnostic to monitor your liquid measurement over time. Continue reading
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 chromatic samples that can not be properly measured at larger path lengths.
My green tile values are not correct in the EasyMatch QC software. How can I change them?
To edit the existing green tile values for your instrument in EasyMatch QC go to Sensor/ Diagnostics/ Green Tile Test. An EasyMatch QC window will open that prompts you to install the standard port plate. (The standard port plate is the one with the largest area view possible for your instrument.)
“True Color”, “Apparent Color”, “Adams-Nickerson”, “Biodegradable Colour” are all the same name for what we call ADMI Color (American Dye Manufacturer’s Institute). Continue reading