Harold has a good point. Once you find you want to use tech pan, there are several alternatives to expensive and slow technidol. I've used Ethol TEC at an E.I. of 100 and am currently using diafine with an abbreviated development time in the "b" solution at 100. I've not tried the Photographers Formulary developers, but they also are much less expensive.(posted 9153 days ago)I suggest using technidol with the first couple of rolls as it is straight forward and should be in most camera stores that sell darkroom chemicals.