well, strangely enough, most catalogues mention weight in grammes but the catalogues from 1910/1915 and the one from 1926 mention liters or 1/8, 1/16,1/32 liter and so on. Why a different system in those 2 catalogues is beyond me.
the catalogues mentioning the weight in grammes use liters or fractions when reffering to the bandflessen or band/beltbottles (Larger bottles ranging from 2 liters to 1/16 liter, all having the same shape. Bandflessen are named that way because they have bands/belt of glass sticking out at the bottomsides and topsides, sometimes they are called bobbin-bottles because they kind of resemble the old-fashioned wooden bobbins))
The strangest part of that is using fractions, as the de-facto usage for a decimalized measurement system is tenths. Technically, a gram of water is a cubic centimeter, (CC, aka millilitre), but you generally don't use them interchangeably unless it's pure water.
My experience has been that people raised strictly with the metric system tend to be horrible with fractions, while those using Imperial or both (Canada, UK, AU, US) tend to be flexible.
It's just very interesting.
I'll admit, I like the shape of those bobbin bottles. I wish they sold ink in those now - I'd buy a few, even if I didn't use the ink!
Brown glass - brown glass is often recycled/re-melted glass. When you blend black, brown, green, blue, etc together, they end up being brown glass. That's why beer bottles in Canada were brown for a very long time. (I remember walking along the sides of the roads, picking them up from the ditches, to take to the government store for the deposit)