NEW YORK CITY: Mulberry Street c early1900s, autochrome photograph. Autochromes are among the first commercially successful forms of color photography. The color dyes in the photographs are held by potato starch.
is to slide a sheet of aluminum-faced foam insulation board behind the radiators. This type of insulation is sold in many large hardware stores and home centers, but if you cannot find it you can make your own by gluing aluminum foil to the face of some foam-core board, which can be bought in most art supply stores and hobby shops.