Digital BW, The Print

It's clearly noticeable by eyes.
I have no spectrophotometer, but after noticing it, I dug on the net 
and found : 
piezo black on HPR Dmax 1,58
B9180 on HPR: Dmax 1,75


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, "Roger" 
<rsmith02@...> wrote:
>
> What kind of Dmax difference are you seeing on matte papers?  I'm 
> surprised there's that big a difference among modern pigment blacks.
>