I found and marked BLT (Big Legs Two) this weekend. I put a white blob on her (that shows she was born in 2016). Queens are colour code depending on the year to help us remember and keep track of our ageing Queens. Though I have to admit to being a bit lucky here - I've only ever had a white marker and this year it's come into its own!
I trapped her under a crown of thorns to keep her still while I marked her - you can see it all in this videohttps://www.youtube.com/watch?v=PUhn4wtcUgc&feature=youtu.be