Formulary's 106 Warm Tone Paper Developer is equivalent to Edwal 106 and Ansco 115. It is a glycin and hydroquinone-based developer. Developer 106 is a specialty developer and is popular for the reproduction of old photos. Formulary developer 106 produces warm blacks to engraving brown on chlorobromide papers. The final color of the print depends upon the dilution of the stock solution. The prints have normal tonal separation and normal to low contrast. The chemicals in Formulary 106 are used to make a stock solution which is diluted 1:7 or up to 1:15 depending on the warmth of the tone desired. The stock solution is stable for 3 to 4 months.