I have denatured alcohol which, according to wikipedia, is composed of roughly:

  • 85% ethanol
  • 10% water
  • 3% methanol
  • 1% aceton
  • 1% pyridine

My solution has a blue color. Can I use this as a replacement for isoprop. or pure ethanol to clean my PCBs?

  • \$\begingroup\$ It depends on if the residue that is left will affect your PCBs operation. \$\endgroup\$
    – PlasmaHH
    Feb 18, 2016 at 11:39
  • \$\begingroup\$ IPA should be obtainable (for private citizens) at or below $5 per liter at larger quantities, absolutely no more than $8 per liter bought per liter, or $10 ~ 15 per liter at sub-liter quantities. With 1 liter you should be able to clean dozens if not hundreds of square meters of PCB when used in the correct sparing manner. I think buying a small bottle of IPA isn't going to be the major cost of your hobby. \$\endgroup\$
    – Asmyldof
    Feb 18, 2016 at 12:42

1 Answer 1


Acetone can dissolve some plastics, so I wouldn't use this unless it was carefully tested on those specific boards.

  • \$\begingroup\$ Do you maybe know if pyridine or the blue colorant can react with the pcb or leave residues which are conducting? \$\endgroup\$ Feb 18, 2016 at 12:43

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