Hi-
There is another topic going on an E-Grill, and I had mentioned that it couldn't be a "Z" Grill because it wasn't light rose.
I misspoke. I meant to say "Dull Rose". All of the experimental grills on a 3c A25 stamp are only found in "Dull Rose". The first grills were experimental grills-- so that would be the "A", "B", "C", "D" and "Z" grills.
The "E" grills are found in several shades that have been identified by Mike McClung:
PALE ROSE
BROWNISH RED ROSE
LAKE RED
ROSE RED
DULL ROSE RED
Scott's lists 3 shades for #88: Rose, Pale Rose and Rose Red
Scott's lists a minor variety as #88a: Lake Red
Mike McClung does not list "ROSE" as a shade for #88, which is in conflict with Scott's.
So, I have been able to ID all of them except "Dull Rose Red", which I may have, but haven't been able to confirm it. Here they are:
PALE ROSE, Rarity Factor = 6

BROWNISH RED ROSE, Rarity Factor = 6


ROSE RED, Rarity Factor = 4

LAKE RED, #88a, Rarity Factor = 6



The Lake Red, #88a's each looks different, but when you look at the individual pixels on a high-res scan (9600), there is violet in each of them, which makes the color Lake.
I haven't been posting much lately, so I thought I'd throw these out there for those who have followed this stamp in the past....
Thanks, hope this was helpful.
Ray