How to identify your squirrel after release.

[Treecat]

Hi TSB members,

Am preparing to release my 2.5 year old frustrated male singleton, Baby Heimer and wanted to know if you folks have any suggestions on how best to mark him so I can identify him after release.
One guy suggested notching an ear, but I'm not for that at all. No hurting my baby!
Another suggested a paint mark but I dont know if that would be toxic for him when cleaning himself.
Another suggested to cut the hair flat in the tip of his tail but said best to see what ideas were offered on TSB!
So here goes!
What suggestions or ideas do you other squirrely folks have that would help me to know my baby once hes out? Appreciate your suggestions!
Thanks!
Treecat.