All vague spray-on decors on these powder boxes and vase are done on a satinated milk glass so the colour would adhere better. The high gloss decoration on the apple is done on milk glass and probably fired on. I think the kiss kiss decoration on the powder box was done by hand, the sides of these are spray decorated.
I think we have a mix here of Fria glass, possibly Walther, probably Hoyerswerda and maybe something Belgian?