Reader-added tags include "Twinkle☆Teehee-bleah", "You can make it with stuff you can buy around the house", and the still-popular "It's written 'manga artist' but pronounced 'jack of all trades'".

Kogasa said:

And that's how you can do this with stuff you've got around the house, so let's give it at try!!

That's just the circuit lines.

What about the conductive ink that is actually responsible for distributing electrical energy to all the soldered-down components?

Etnaz said:

That's just the circuit lines.

What about the conductive ink that is actually responsible for distributing electrical energy to all the soldered-down components?

You actually don't need anything else, I think.

The etching fluid mentioned in the previous comic will dissolve exposed copper so you use the lacquer to cover up the bits you want to stay copper-y, and use the laser to expose the bits you want to dissolve. Then after you finish the bath you remove the lacquer and (hopefully) have all the conductive traces ready to go.