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FLEXO Magazine : July 2013
they have the greatest difference in the amount of UV light they illuminate. This study demonstrated that the presence of OBAs in sub- strates needs to be addressed, as it can greatly alter the mea- surement of color under different measurement conditions. A greater area of unprinted substrate that contains OBAs will lead to a greater fluorescing effect, thus causing me- tamerism when viewed under different lighting conditions. It is worth noting that when comparing illuminants with and without UV-light for solid colors, the DE of the lighter color, PMS 299, was significantly higher than the DE of the darker colors used in this study. The DE00 of the solid PMS 299, when compared under M1 (D50) an M2 (UV-Cut), was enough to cause significant metameric effects under varying lighting conditions. Overall, this study shows proof that it is important for de- signers and printers to take into consideration the way colors will be reproduced on a substrate in order to avoid extreme cases of metamerism. Because flexography deals with the use of multiple spot colors significantly more than other print- ing processes, it is possible to avoid metamerism by mixing different shades of a spot color, instead of printing the same spot color with different halftone dots to avoid large areas of unprinted substrate. However, this can be an issue for multiple reasons. The first is that the majority of artwork being reproduced is much too complicated to easily separate into a small set of spot colors. The second problem is that the job becomes much more expensive as more spot colors are added. The trade off of having a consistent brand color under any lighting condition and producing a cheap product is one that a company will have to weigh on its own. While it is clear that smaller tint percentages create larger DE in color, further research is needed to determine whether the hue of the color or the brightness/saturation of the color has a greater effect on determining whether it will be more prone to metamerism. n About the Author: Eli McNutt is a 2013 graduate of California Polytechnic State University, San Luis Obispo, CA. this paper represents the final report on his 2012 Foundation of Flexo- graphic Technical Association Rossini Scholarship. Experi- ments that it is based on were conducted throughout the year under the supervision of Faculty Advisor Malcolm Keif, California Polytechnic State University, Graphic Communica- tion Department. References  Keif, M. and Vogl, H .,Color Measurement on Sub- strates with Optical Brightening Agents. 18th IAPRI World Packaging Conference. 2012. pp. 102-109  Yamaoto, S ., Problems with Color Proofing from a Colormetric Point of View. Special Review Japanese Society of Printing Science and Technology. 2010; 47(5). pp. 319–324  The CIE Color Models. 2000. Adobe. Retrieved From: http://dba.med.sc .edu/price/irf/Adobe_tg/models/cie. html  ISO 3664: 2009. Graphic Technology and Photogra- phy – Viewing Conditions  Cheydleur, R. and O’Conner, K., The M Factor...What Does it Mean?. 2012. X-Rite. Retrieved From: http:// www.xrite.com/documents/literature/en/L7-510_M _ Factor_en.pdf  ISO 13655: 2009. Graphic Technology — Spectral Measurement and Colorimetric Computation for- Graphic Arts Images 2013 FFTA Rossini North America Flexographic Scholarship Competition Congratulations to our winners! 1st Place - California Polytechnic State University Natalee Consulo, Mark MacManus & Lena Haidar 2nd Place - Western Michigan University Zachary Root About the Scholarship The FFTA Rossini North America Flexographic Scholar- ship is one of the industry ’s most generous and prestigious scholarships bestowed annually to those students looking to further themselves in the flexographic industry. The award amounts for students and their respective educational institutions are as follows: First Place: $13,000 Student award = $10,000 Institutional award =$3,000 Second Place: $9,500 Student award = $7,500 Institutional award = $2,000 Details on 2014 FFTA Rossini Flexographic Scholarship available Fall 2013! Visit www.flexography.org 36 FLEXO July 2013 www.flexography.org Submersible Longer Life Tighter Tolerances Higher Quality No Ink Penetration The new HD.WaterProofTM sleeves from Apex represent a real “sea change” for the flexo industry. Lightweight and easy to clean and handle, Apex HD.WaterProofTM sleeves ensure greater consistency and a higher quality print throughout. The revolutionary design minimizes ink penetration, leading to increased life expectancy and substantially lower costs. So why not take the plunge and see what next generation anilox sleeves can do for you? HD.WaterProofTM from Apex: leaving the competition high and dry. visit www.apex-groupofcompanies.com