That's interesting. As a glassblower I don't understand why that ever would have been a difficulty. I suppose they were trying to etch the glass previously, rat

That's interesting. As a glassblower I don't understand why that ever would have been a difficulty. I suppose they were trying to etch the glass previously, rather than to apply a coating. Huh, it turns out his solution was acid etching the inside of the bulb, which was what I assumed they tried that didn't work.