No, you may only mark your ball when it is on the green.
Anonymously
any marking is legal i.e. dots, initials, names
No penalty, play the balls as they lie. You may need to mark one and then after the other one is played replace it. The one that was originally stationary should be replaced to as close to its original location as possible.
Golf ball
A Golf Ball
Golf Ball
It is a golf ball that has the logo of a resort/golf course printed on the ball.
That would be a golf ball.
A golf ball.
a Golf ball
A golf ball weighs more.
There are 366 dips in a golf ball