Still it would be useful to provide a little more information than you have. I use Photo Rag Ultra Smooth sheets and have not had any issues. What is the sensitivity you are seeing?
We are currently working on a very big job, over 2 thousand square feet.
And all used HFA Photo Rag 308 paper.
After printing and trimming, we float mounted the print on acid free foamboard with acid free adhesive, then we framed it and sealed the back to avoid air get's in and out easily. We have been doing museum hand craft framing for almost 10 years for top of the line museums and galleries all over the world, we know what we are doing.
But the edge of the paper start to turn yellow last week. The only good news is we didn't ship out anything to our client yet.
So now, we have to take everything apart, re-print, mounting and some of them need to be hot foil, then frame everything back in.
Basically we will lose money on this job but still, we have to finish the work in a perfect way.
Today I had a meeting with HFA region GM. Basically what he said is all Photo Rag paper from HFA are very frigiel. It has to be lived in a very clean atmosphere, otherwise, the paper will turns into yellow easily. Specially we are in China.
His suggestion was to secure the paper, we better use liquid lamination / coating to seal the paper base and avoid the contact to the air.
I can understand what he was trying to say, but what we have in our office is a framed picture, printed on the same paper, and finished in the same way, but still got no yellowing issue for 3 years. I'm not sure if this is luck or what but right now I am not happy because like what I've said, I will need to print over 2 thousand square feet agian...........
aaron