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Color fading of Backlit

Posted on Wed, 21 Jan 2004 at 20:26



Hi,
I have an Encad 750
Ive been using GS+ inks and now I passed to GX
The thing is that some backlits we did about 6 months ago are starting to fade.
I need my signs to last at least 1 to 2 years.
Also I need to know about the distance between the fluorescent lamps and the prints.
Thanks,

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Anonymous says: Esteban, The first thing I have to ask is are the colors that are fading CMYK or Pantone/Spot? The second question, is Encad an ink jet based technology? I'm an Ink technician, so what I say can be taken ...

Esteban,
The first thing I have to ask is are the colors that are fading CMYK or Pantone/Spot?
The second question, is Encad an ink jet based technology?
I'm an Ink technician, so what I say can be taken with a little bit of creditibility.
If you are using an Ink-jet system, make sure that the Ink's are made with PIGMENTS, not DYES, Dyes are very weak, and not LIGHTFAST. A lot of older systems used dyes, pigments are just starting to come on-line.
If you are screen printing and using PMS colors, the reason that you are fading is poor pigment selection by your ink manufacturer, Warm Red (Red Lake C), Rubine (Lithol Rubine), Reflex (Alkali blue), Violet (Methyl Violet), Rhodamine/Purple (Blue shade Rhodamine) Green (Phatlo green shade), ect, are all weak pigments, and have been largley phased out in most types of printing. 032 and 021 are supposed to be lightfast pigments, but most people use warm red, yellow and rubine to imitate the hue. If you want fade resistant reds, insist on blue shade Napthol or yellow shade napthol, for violet, ask for Carbazol violet, Rhodamine/purple, quinactridone, and green, use process blue and yellow. I would make these issues know to your ink supplier immediatly, and from this point forward, hold them liable to light fast standards. Thomas Dunn thomasdunn13@comcast.net

posted on: Sun, 06/27/2004 - 11:53am

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