Quote Originally Posted by glbeas
Sounds like a weak first developer. When I was doing my own E6 I used to let the color developer go longer than the suggested time and I thought it made the colors look richer. Is this something others do and would it have any deletrious effect on the color balance? One of these days I'd like to try my hand at LF E6.
Or, more likely, low temperature. Ordinary darkroom thermometers are sometimes off by up to a couple of degrees.

Also, I've noticed that some kits (e.g.Tetnal 3 bath) tend to produce somewhat denser transparencies than others (e.g. Kodak). Since I mostly make prints from them, the differences do not really affect my work.