Graphite and iron oxide from acid mine runoff on watercolor paper
Graphite and iron oxide recovered from acid mind runoff on watercolor paper
Graphite and iron oxide on paper
Graphite and iron oxide recovered from acid mine runoff on watercolor paper
Charcoal and iron oxide recovered from acid mine runoff on watercolor paepr
Graphite, powdered graphite and iron oxide recovered from acid mine runoff on watercolor paper
Charcoal and iron oxide recovered from acid mine runoff on watercolor paper
Graphite (powdered and in pencil form) and iron oxide recovered from abandoned mine runoff on watercolor paper
Powdered graphite and iron oxide recovered from acid mine runoff on watercolor paper
Charcoal and iron oxide recovered from acid mine drainage on watercolor paper
Graphite and iron oxide recovered from acid mine drainage on watercolor paper
Charcoal and iron oxide recovered from acid mine runoff
Charcoal and iron oxide recovered from acid mine runoff recovery on watercolor paper
Graphite and iron oxide recovered from acid mine run-off on watercolor paper
Powdered graphite and iron oxide from acid mine runoff on watercolor paper
Graphite and iron oxide on watercolor paper
Charcoal, powdered charcoal, powdered graphite and iron oxide recovered from acid mine drainage on watercolor paper