The present invention provides compositions derived from a polycarboxylic acid, a polyhydroxy compound, a dye and a basic crosslinking agent. Moreover, the invention pertains to utilizing an optical pulse stretcher to convert optical data encoded in a second format to optical data encoded in the first format. A sample is incubated with the soak solution to the point of saturation at a temperature above the melting temperature of the water-miscible solvent but below 0\xb0 C. The second transistor is formed in a second region of the substrate.