twigs from blackthorn bundles in the wooden beams of a graduation mill, where the brine trickles down and evaporates to form

aerosol blackthorn branches brine brown brushwood bundle bushes calcium carbonates coating concentrated crusts deposits droplets evaporates evaporation grading graduation gray greyish gypsum health hedge iron leaking lime magnesium mill minerals plant pollution production prunus resort salt salts saltworks sloe spinosa stone thorn thornstone towers trickle wall water wet works yellow