Response to pulling hp5 to iso 250

Using a 1:3 dilution at the time for a 1:1 dilution is much too great of a reduction in development. My approach, esp. as you say the lighting was flat, would be to make either no adjustment to the development time or a small reduction. ID11 at 1:1 is a good choice. It would be better to start with your normal times for HP5 rather than the manufacturer's, because your agitation, thermometer and type of enlarger light source will make a difference. If these pictures are important to you, it would be a good idea to develop a test roll.

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