We’ve all seen these mysterious and wonderful signs in our daily landscape. As most of the products and information these signs represented are long gone, one can now see them as a different kind of art, as was their beginning.
* Ghost signs were originally painted with oil-based house paints. The paint that has survived the test of time most likely contains lead, which keeps it strongly adhered to the masonry surface. Ghost signs were often preserved through repainting the entire sign since the colors often fade over time. When ownership changed, a new sign would be painted over the old one.
Conservators today are being asked to preserve the original signs rather than painting over them. New products for consolidation are available that structurally stabilize both the components of the paint and the masonry substrate. The website Preservation Science discusses research, pertinent to ghost signs, that went into preserving the paint on the exterior of the Building Museum in Washington DC… * Wikipedia