I recently got a bottle of Printol 12 paper developer. The directions read:
Printol 12 is designed for dilution 1:4 up to 1:12 parts water for general use. For normal, full scale prints and standard enlarging apers, dilute 1:12. For contact papers, dilute 1:8. At extreme dilution, 1:20 for "soft" results with higher contrast paoers and warm toned portrait papers.
Development times: 1 1/2 to 2 minutes at 70 F - for best results. Quality prints may be obtained from 65 F up to 100 F. Extending processing times up to 6 minutes or more produces enlargements and prints of maximum brillance and tonal scale.
The last sentence is what confuses me. Maximum brilliance and tonal scale sounds good, but how do you extend the processing times to 6 minutes, if the best results processing is 1 1/2 to 2 minutes? Do you dilute further? Expose less? (And why isn't the maximum brilliance and tonal scale considered the best result?) Sorry if this is a dumb question...