Board contours burnt in wood.
Phenolite aligned with the contours for each board.
From tests of week 3, could find best Laser GRBL settings (Sculpfun S30 Pro Max 20W):
2000 mm/min
Power 36% (7.2 W)
M3 - Constant power
Spacing 20 lines/mm
Tracking line by line
Brightness 0%
Contrast 100%
White clip 0%
Automatic size (mark EXIF)
Position X=20.0 Y=20.0
Damaged paintings were fixed using retroprojector marker pen.
PCB design burnt by laser into ink.
Charred ink cleaned by brushes.
Copper corroded by iron perchloride.
Ink removed by kerosene.
Copper was cleaned using solder flux and protected against corrosion using silver nitrate.