Scratch a line with a fine sharp point, I usually use the back end of a brush, a knife or a credit card. Some brushes have a sharp end or scraper built into the handle. Use those first! The wet paint is sucked into the bruised paper fibers as you scratch across the wash, creating dark lines.
Used carefully, this technique is excellent for adding details to landscape paintings. Fall or winter scenes will always show naked trees and branches.
Notice the dark edges that automatically form where you scrape away the paint. You have to be quick before your background sky or landscape dries!
Had I waited another minute the scraped areas would not have as much back fill (smooth edges).
Timing is everything. Scrape too soon, you'll get backfill. Scrape too late and it won't work at all.
Experiment!
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