reduce to scribbling

A severely phlegmy wingpiglet meant no jaunt to Silverknowes/Cramond to put some signs up on lamp-posts, but I'd bought some chalk earlier (after failing to find where I keep my big tub of giant chalk) and expended several sticks on the way to the shop. Even trying not to press too hard each stick was only good for one URL and one hashtag at reasonably-visible size before it was reduced to a small sliver between thumb and ground.