TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Component: The oxidizable metal component comprises silver (preferred), cerium, copper, aluminum, zirconium, titanium, bismuth, cadmium, copper, lead, silver, tin, lead, zinc, or their alloys. It may also comprise conductive pastes, conducting wires, bus bars, conductive coatings and reflector films. The solar cell(s) is wafer-based solar cells from crystalline silicon or multi-crystalline silicone based solar cells. The oxidizable metal component is a reflector film comprising silver or an alloy of silver.    TECHNOLOGY FOCUS - ORGANIC CHEMISTRY - Preferred Component: The PVB encapsulant comprises up to 1.5 wt.% chelating agent(s). The chelating agent is EDTA (preferred), ethylenediamine monoacetic acid, ethylenediamine diacetic acid, ethylenediamine triacetic acid, ethylene diamine, tris(2-aminoethyl)amine, or diethylenetriaminepentacetic acid. The PVB encapsulant further comprises additive(s) from (wt.%) UV absorber(s) (0.01-1), thermal stabilizer(s) (0.01-1), unsaturated heterocyclic compound(s) (0.01-1), and hindered amine(s) (0.01-1). The UV absorber(s) is benzotriazole derivatives. The thermal stabilizer(s) comprise octylphenol or butylated hydroxytoluene. The unsaturated heterocyclic compound(s) is triazole, imidazole, pyrrole, pyridine, purine, pyrazine, adenine, triazine, benzotriazole, benzothiazole, benzoxazole, 2,2'-dipyridyl, 2-mercaptobenzimidazole or thiazole. The hindered amine(s) is 2,2,6,6 -tetramethylpiperadine, 2,2, 6,6 -tetramethylpiperadinol, 2-(dimethylamino) pyridine, 4-(dimethylamino) pyridine, N-butyl piperidine, N,N-diethyl cyclohexylamine, or hindered amine light stabilizers. The solar cell(s) is thin film solar cells from amorphous silicon, microcrystalline silicon, cadmium telluride, copper indium selenide, copper indium/gallium diselenide, light absorbing dyes, or organic semiconductor based thin film solar cells.    TECHNOLOGY FOCUS - POLYMERS - Preferred Component: The pre-lamination assembly further comprises additional layer(s) from a second PVB sheet, two protective outer layers, and a substrate or superstrate. EXAMPLE - Solutions of poly(vinyl butyral) (PVB) (6.9x 10-5 mol; molecular weight approximately 145000 Da; 18.8 wt.% OH; less than 1.5% vinyl acetate), silver nitrate (1.2x 10-5 mol), and additive(s) were prepared by dissolving silver nitrate and EDTA (1.1x 10-3 mol) in methanol and then adding the silver nitrate solution into a methanolic PVB flake solution. The solution was then heated to 60 degrees C for 2-8 hours and its color change was monitored. The color change was measured, and yellowness index was calculated by ASTM E313-05. The results showed that the solution containing EDTA had a yellowness index that was greatly reduced compared to that of comparative PVB/silver nitrate control solution without additives.