RE: Spectrolino repair
RE: Spectrolino repair
- Subject: RE: Spectrolino repair
- From: Roger Breton <email@hidden>
- Date: Thu, 11 Feb 2016 20:55:08 -0500
Graeme,
I've seen ink fluorescing on groundwood stock. Typically, it is yellow ink fluorescing because, I was told, because the pigment involved is diarilyde yellow #12 which is known to fluoresce when it comes in contact with fountain solution in the press. This is nothing new, to me, Graeme, and it never seemed to affect measurements?
On typical #5 grade coated stock, measuring an IT8.7/4 chart with UVcut filter ON and UVcut filter OFF turns out an average delta E of less than 1.00 with a max of 3.00 between the two sets of measurements. Hardly a problem in my view.
I agree, when I illuminate printed substrate with this ink, using strong 360nm UV illumination -- my faithful UVL-356 lamp --, I can clearly see patches containing yellow ink fluorescing. No doubt about that.
The same ink causes the same phenomenon on higher quality grades too.
Is that what you had in mind?
/ Roger
-----Original Message-----
From: colorsync-users-bounces+graxx=email@hidden [mailto:colorsync-users-bounces+graxx=email@hidden] On Behalf Of Graeme Gill
Sent: 11 février 2016 20:42
To: ColorSync <email@hidden>
Subject: Re: Spectrolino repair
Roger Breton wrote:
> Are you referring to ink fluorescing? In addition to fluorescence coming from the substrate?
Yep. Fluorescent inks are vivid, but don't profile teribly well using instruments with an 'A' or white LED type illuminant.
Graeme Gill.
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