Is it safe to ducktape tires?

Is it harmful to put ducktape on the tire tread?

When doing the winter changeover I started putting a piece of ducktape on the tread where I write with permanent marker which wheel the tire came from.

When it is time to change back I peel off the ducktape. There is some residue remaining, but after driving for a few km, it comes off. The tire makes strange noises when driving with the residue. It is gone almost instantaneous though.

Is it possible for the ducktape glue to leech into the rubber and affect the compound?
I mark with chalk in a few places in case one or two may rub off
 
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