Lacing is when the entire feather is edges by a contrasting colour.
Mottled is when the feather tip is white.
Duckwing is a group of varieties where the males' primaries are a contrasting colour; when the wing is folded they form a triangle of contrasting colour at the end of the wing.
mottling seems more random than spangling, is that typical or just on poorly mottled birds? I had looked up spangle before when I was trying to decide which of my appenzeller spitzhauben to keep. My ancona are more of a mottle, more random and opposite color scheme(black w/white) as opposed to the spitz(white with black) which have a more uniform pattern
The names given for different colours can be terribly confusing.
Sometimes the same colour is called different names depending upon the breed. Or what is meant by one name in one breed can mean a different colour in a different breed. And that's within one country....When one starts looking at the names used in various countries it just becomes incredibly confusing.
I agree that mottled plumage appears more random than spangled (lumping BBR spangling in with mottled, here), which appears to be VERY precise on better birds.
It doesn't help that the standard uses the term spangle to describe the specifics of both mottled and spangled plumage, and defines spangle as "A clearly defined spot of color at the end of each feather and differing in color from that of the ground."