This has turned into a really good discussion about the difficulties in color manipulation for print.
In response to Biggs: Right! Also, the Indigo is a liquid toner based ink system so you have the extra leeway of using finer distinctions for gradients. The funny thing is that when we look at the series of labels that ran for a couple years on an Indigo somewhere else it has a much wider color range. In other words, we are able to be more consistent once we have the color down. (Our Floor Manager is the Bomb).
The problem I have found is that with this particular press, while it prints beautiful color, has a poor control unit (replaced on the newest model btw - I believe Just-B mentioned this in a different post), it uses process blue instead of cyan, and is not G7 compatible.
So when you guys talk about gradients and how they get muddy, pink, or blue (we use the terms brown (warm cast) or grey (cool cast), I am VERY aware of the difficulties. I have a boatload of tricks to take care of banding, striation, dot gain difficulties, transparencies, spot colors (and spot color transparency and gradients)…
I asked the original question because we are trying to hit a consistent approx 12% transparency of battleship grey. In order to do that we are down to 1 or 2% in each channel. That is well within humidity, paper, and toner variances so I’m looking for solutions/tricks to try.