It helps if you have marked queens. Much easier to spot a red, green or other colored spot. Diff.colors for diff. years. This also helps you keep track of how old your queen is.
"Be Warned You Require Gloves"; Blue White Yellow Red Green. Years ending in "0" & "5" = Blue, 1 & 6=White, 2 & 7=Yellow, 3 & 8= Red and 4 & 9= Green.