The bleaching properties of a hydrothermal, Arkansas quartz are studie
d in detail. The thermoluminescence (TL) and phototransferred TL (PTTL
) signals are examined as a function of wavelength, illumination time
and temperature at which the sample is illuminated. We have also brief
ly studied the effects of pre-irradiation annealing on the sample. The
results of these experiments are described and their relevance to the
models for TL is discussed.