Digital BW, The Print

I don't know if some "puckering" of the bottle is a danger sign.  Ernst noted that there are other things that could do this.  I do think it's a good practice to agitate that bottle a few hours before pulling ink from it.  That allows any serious clumps to settle.

Paul
www.PaulRoark.com 

--- In DigitalBlackandWhiteThePrint@yahoogroups.com, ascherjim@... wrote:
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> Paul observed "Keeping the particles separated is mostly done these days with a coating that gives the particles an electrostatic repulsion.  I think this coating oxidizes.  I've seen old Eboni bottles pull in slightly, as if air is being sucked out of them.  I think it is.  The coatings (not the carbon) may be oxidizing.  This would mean the particles would not have the electrostatic repulsion needed to keep them from clumping."
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> A month or two ago I bought another bottle of Eboni Black from MIS with a "use before" date of 9/4/2013.  The bottle has not yet been opened, and was already significantly "puckered" upon arrival.  Need I be concerned?  
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