The Edwal top quality black & white print developer for home darkroom and studio use. On RC papers, Platinum II provides a natural (not bluish) black image, and yields truly superior quality results with warm-tone fiber-base paper, providing a rich warm black.. Standard contrast on cold-tone papers is produced with the usual liquid dilution. Same dilution on warm-tone papers gives a bit softer print. Diluting with more water will obtain softer results. Contrast can be increased slightly by diluting with less water (1:7). Dilution ratio of 1:8.