'Burning Glasses' in Ancient India, another question

[kellner at ue.ipc.hiroshima-u.ac.jp]

In article <199504222008.NAA23661 at piccolo.cco.caltech.edu>
vidya at cco.caltech.edu writes:

>> Many advaita works utilize a stock metaphor of a sphaTika crystal appearing
>> colored because of being viewed through a colored gem. By itself the sphaTika
>> is clear, but falsely attributing the color of the other gemstone to it, is
>> described as an error of perception. I am not aware if the example is used by
>> Sankara or sureSvara, however. 
>> 
Could you give some sources for such examples, please ?

Birgit Kellner
Institute for Indian Philosophy
University of Hiroshima