Digital BW, The Print

When mounting prints made with MIS UT7 inks, is it best to use buffered 
or unbuffered materials. I had not really thought much about it until I 
read remarks on one vendor's web site implying that unbuffered 
materials might be best for use with traditial color prints because of 
possible color shifts caused by interactions between dyes and buffering 
agents. Is there an issue with modern inkjet inks such as the UT7 or 
Epson Ultrachrome inks?