Today let me know the chemistry is such important in our life, maybe some of you are very good at it, but this subject is more difficult and challenging for me, I think I will never give it up and keep go on studying chemistry in my free time, because of you are standing with me.
The photos are lasered metals with laser ink.
You also can read more information from this link (write it by myself):
https://www.instructables.com/id/Laser-Ink-for-Metals/
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