Phenomenon related to DIY PCB fabrication, where acid gets concentrated on tracks' sharp angles causing over-etching.
Phenomenon related to DIY (at home/school/college using glossy paper & etching solution)pcb-fabrication using traditional etchants (non photoactive ones), where too much acuteness of angles between 1 or more track(s) causes the acid to react more (sharp turns imply more ion exchange due to charge leak) at those turns, causing over-etching.
