Quote Originally Posted by chrobry View Post
Forgive me naive questions, please, but what is Harvey's?
The official name is "Harvey's 77 Panthermic" and it is a proprietary film developer that utilizes glycerin and p-phenylenediamine (ppd). The panthermic reference means that it can be used at a wide range of tempratures from 55 degrees to 100 degrees F but is best at about 75 degrees F. If is a replenishing developer that means that after a certain amount of film has been developed, a portion of the developer can be dumped out and a similar volume can be added to bring the developer back to its original developing strength. I can be kept with replenishment for an extended period of time in large developing tanks or poured into trays for use. There is an article on this developer at unblinkingeye.com.