A series of photochemical experiments on the color centers present in KBr and KCl after exposure to x rays at 80°K is discussed. These experiments are chemical in nature with the reactions being triggered through exposure to radiation of various wavelengths. It is shown that the only V center which has a large electron capture cross section is the VK center and the cross section of the V1 center is very small. It is also shown that the destruction of the V1 center does not involve the annihilation of an electron or hole trapped at a crystal imperfection but apparently involves the addition of an interstitial to the F center, yielding as a product the undisturbed lattice. The implications of these observations as they relate to the structure of the V1 center are discussed.