Abstract: The green silver colloid and yellow silver colloid were prepared by two-step photochemical procedure and UV photochemical procedure respectively. Their sizes measured by TEM are 100 nm and 40 nm respectively. The green silver solloid exhibits two absorption peaks at 393.9 nm and 713.3 nm , The absorption peak of yellow silver colloid is at 419.3 nm. They have a maxium resonance scattering peak at 470 nm, and the green silver colloid has other two resonance scattering peaks at 340 nm and 680 nm.

Key words: green silver colloid, yellow silver colloid, photochemical procedure, resonance scattering spectroscopy