I'm reading through Paul Smulder's build of 'The Shipyard' (from 2013)...a great read BTW...I'm currently at the part where he's applying Brett's 3-tab asphalt shingles.
1:1 asphalt shingles have multi-colored granules attached to the wearing surface of the shingles....I'm wondering what could be sprinkled on the model shingles after they're applied to the roof substrate...perhaps any granular substance would be 'out of scale' in HO...maybe I'm over-thinking the whole thing.
Thoughts...ideas...anyone ever done anything like this? To be fair, as I continue reading thru Paul's build I'll find that he has done this very thing....
I highly recommend reading thru the old and long buried postings... a wealth of information resides in them