Of course there were changes in photos quality, some of the photos treated in C-22 were very different from the modern ones, with their vivid colors. But not only the developer was other, the bleach bath determines also the color quality. I discovered in the internet this photo, among others, here.
|Photo from the 70's|
|One of my first attempts|
But this color is, for me, mainly a matter of the bleach used. So, if you want to achieve a 70's look, try this bleach, but be very precise in the time because it may bleach completely your film if you give it time to act.I have been working with 3 minutes bleach constant agitation to prevent uneven bleaching like in the photos above.
|Another example pf a photo of the 70's but made in 2012|