Sal-ammoniac Brown or rust blue formula

[Topfmine]

I have been looking at using Sal ammoniac or ammonium chloride as its called for a rust blue project. I am a bit confused with the solution, the R.H Angier book says that the mix is 2% ammonium chloride but to mix with what? I guess it's distilled water at what %. Is it 2% of say a 100 grams of distilled water, 2% of what ever quantity of water you user. Can someone enlighten me.

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[Vincent]

Yes, water.

20 grams per liter.

If you’re in the UK there’s probably enough humidity in the air. A humidifier will speed things up.