The Hall mobility of electrons in colored NaCl, KCl, KBr, and KI has been measured using an unconventional technique previously described by the author. Measurements on additively and x-ray colored NaCl yield an electronic mobility of 250+/-50 cm2/volt sec at 84°K, decreasing to about 25+/-25 at 200°K. In additively colored KCl the mobility is 100+/-50 at 90°K in additively colored KBr it is about 110 at 84°K. In additively colored KI the mobility is 155+/-30 at 84°K, decreasing to 30+/-15 at 200°K. In every case the sign of the Hall effect is electronic. These observations are consistent with the mobility theory of Low and Pines assuming effective mass ratios between 0.35 and 0.6 for the unpolarizable crystal, or polaron effective mass ratios between 0.5 and 0.9. These mobility data combined with photoconductive yield data give values of the capture cross section of F centers for electrons (to form F' centers) between 0.7 and 5 times 10-15 cm2 at about 200°K.