Just mark, do not engrave at all

Just mark, do not engrave at all
I want to mark on plastic of mobile, weak marking, just change the color, do not remove it.
I have seen such work in the store. Just change the color of the plastic
I tried at 1 percent strength. And still weakly engraves, and also removes the paint completely, the plastic becomes transparent,
I tried to raise the laser, and the picture does not come out clear.
I tried to engrave quickly, the picture does not come out sharp.
The image is about 10 mm in diameter

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