Staedtler vs Identi-Pen marker for etching

I wanted to test out the markers for etching as well 
Staedtler red is supposed to be one of the best but I wanted to try the Identipen -
 As you can see the identipen worked better with the ferric - but I am going to do further testing just to be sure
Using the pen is one thing I need to do so I can make my copper beads and ensure the etch will not eat through the marker

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