What kind of pen can write behind a 2-inch photo without fading?

oily pens and markers. Understand the network display according to the query.

1. Oily pen. The ink used is oily, insoluble in water, difficult to fade and melt, and can not fade after 2-inch photo writing.

2. marker. Markers are not easy to fade, especially oily markers, which are characterized by permanent attachment and no fading, and can be written after a 2-inch photo.

Suitable for not sending friends' signatures, mature low-key and connotative signatures.

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