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Easy way to read chip IDs

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I wanted a rude username:
No-clean flux followed by scrubbing with alcohol seems to have the opposite effect: the surface of the chip becomes a matte grey and markings are much less legible. At least in my experience.

wraper:

--- Quote from: I wanted a rude username on January 08, 2020, 05:34:43 am ---No-clean flux followed by scrubbing with alcohol seems to have the opposite effect: the surface of the chip becomes a matte grey and markings are much less legible. At least in my experience.

--- End quote ---
Laser marking is easily visible on clean surface, especially if light falls under angle. If it is not visible, most likely you just spread contamination but not cleaned it. If there is a lot of flux, follow with dry wipe after wetting the surface. If not enough, follow with slightly wet wipe to clean remnants of contamination. Surface should be matte if surface of plastic is not glossy to begin with.

AVGresponding:
Yes, a good (but gentle) clean will help with laser etched markings, but if they are older, printed ones, you might just remove the last chance of reading them!

I wanted a rude username:
The problem is that the flux and/or brushing with alcohol removes the white paint from within the laser engravings. They can still be read under angled light, but less easily than before.

Of course, this batch of 50 AVRs could simply be counterfeit. ;D They work, but while all have the same markings on the top surface, the bottom surfaces have a few different markings. Maybe genuine ICs would use paint resistant to these solvents.

wraper:

--- Quote from: ThickPhilM on January 08, 2020, 06:04:21 pm ---if they are older, printed ones, you might just remove the last chance of reading them![/color][/b]

--- End quote ---
Mild contamination over paint marking does barely anything to readability. In such case smearing thermal paste certainly won't do anything to improve visibility, only make it worse. And my comment was about laser marking only to begin with.

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