It is most definitely an art.
Its also something that no matter how much experience you have, there are no gaurantees that you might not have to clean off and re-do several times before you get the result you want.
To me, 80% does sound too high.
You do not need to get the blade dripping wet. I mix the suspension, wait till all the arsenic sinks, wait a bit longer, then just barely touch the bristles of a soft old toothbrush in the fluid, and rub it on:- blade is just barely damp.
I have never tried to do this job through glass. I don't like the idea. Might work, I don't know.But inside there is no breeze, and a little bit of breeze helps the drying process.
If the blade is really wet, it just will not go black, more likely go yellowish- brown.
You need to get the surface to go really sticky, then you apply the suspension again and keep working it into the blade until it goes sticky again. You keep on doing this till the colour darkens, then you rinse it off, and blade goes pale again, you dry it, and start the process again, and you keep on doing this until when you rinse it off, it stays black. The big trick is to judge what it will look like after you rinse and dry it, so you know when to stop. Do the job in cloudy weather and the white will not sparkle.Don't ask me why, I don't know.
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