Digital BW, The Print

Thanks for clarifying Walt.   The color shift from blue to neutral is  
quite pronounced, but as you suggest not true metamerism.  No green/ 
cyan color under flourescent though.

Carl

On Jan 22, 2006, at 7:55 PM, Walt Mucha wrote:

> Hi Carl
>
> What you're seeing is not metamerism. The light temperature of  
> halogens and incandescent are a considerably warmer color  
> temperature than daylight and that in effect will neutralise a cool  
> tone print. Put it under plain flouresent light and you'll probably  
> see a green/cyan cast. As to Dmax. If these inks last longer than  
> dyes then that's good, if not, it's not all that spectacular. Still  
> waiting for someone to put a color print in their window. I might  
> have to spring for some of these inks myself just to satisfy my  
> morbid curiosity ;-)
>
> Regards, Walt
>
>
> -----Original Message-----
> From: Carl Schofield [mailto:scho@...]
> Sent: Sunday, January 22, 2006 09:36 AM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: [Digital BW] Nanochrome blue
>
> Today I made some visual comparisons of prints I've made over the
> past few days using Nanochrome black ink in an Epson 4000 and
> printing BO mode, mostly on Hahnemuhle Photo Rag 308 and Hahnemuhle
> Photo Rag Satin.  In daylight the prints have a cold blue/black
> appearance, slightly cooler with the satin compared to regular photo
> rag.  Under halogens or normal incandescent lighting the prints on
> both papers appear dead neutral.  So this cold blue color we have
> been discussing with regard to the Nanochrome black inks (K and LK)
> appears to be a metameric phenomenon.  This NOT the ugly metamerism
> we have seen before with other inks that changes on the magenta/green
> axis, but rather a cool/neutral shift.  Seems like the black inks may
> have been designed for neutrality under incandescent or halogen
> lighting.  Dmax is just terrific on these matte papers (1.9-2.0).
>
>
>
>
>
>
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