I don't know who recommended EDDING 404 markers but I must say thank you for the suggestion. The EDDING 404 most definitely can draw SOIC pads and do toner transfer repairs.
So I would conclude that EDDING 404 is by far my first choice for an acid resist pen now.
I always grab some stray pens..and this time a crayon... to check for acid resistance. BIC INTENSITY FINE and LA PEN both just washed right off the copper.
Crayon barely worked.... and crudded up the acid bath.