When in Rome

 Another addition to my Roman States stamps was found in my mix from Elmer. I'm going to look at the latest Linn's weekly, I'm already thinking of what I may find in my next mixture purchase, though I dare say, I'm tempted to give Elmer business once again. This is either #5 or 5a in the group from 1852. The difference is not noticeable to me as one the catalogue describes as "lemon" and the other as "yellow". Seriously, how does one distinguish between the color lemon and the color yellow? Either way they have the same value in my book (2003) of $45.

JimmyB