TechniEtch 1688 organic acid-based copper microetch chemistry is for polymer coating. Reportedly improves yields of fine features with plating resists, etch resists or solder mask; handles conditions like HASL, ENIG, and immersion tin. Provides uniform copper surface appearance for AOI detection. Reportedly removes less copper off printed circuit board; holds more copper in etch solution. 

Technic Inc., www.technic.com