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Ethol LPD Developer is called the "Lasting Paper Developer". This developer is known for its lasting qualities, as well as being non-toxic to skin. LPD contains no metal, provides long life, sharp blacks and whites, and has various dilution capabilities. It works well with all black & white paper types including resin coated. LPD will not change contrast even as you dilute it to create different tones. Suggested dilutions for this developer are 1:4 for warm tones or 1:1 for cold tones.