Allyn,
Your method is pretty much what I was getting to myself. I'm doing a multi-coloured leg tattoo, and the most contiguous same colour stitches is 5 stitches, with a large number of singles. There are 14 colours in one 10 x 10 block out of the total of 30 in the whole project, and two colours have only 2 stitches in the area. Changing needle every colour would have been totally impractical.
The chart for this area is (Note for Mods: I hold the copyright for this chart having created both it and the program that made the chart, so it's not infringing any copyright rules):
I do have a problem with this method, though: It leaves lots of threads attached.
We have 4 cats at home, and they are busy enough for it to seem like there are 40 at times. One fleabag in particular is young and playful, and is
very interested in loose threads.
I'll look out some magnet strips today when I get some more needles. I've tried our fridge magnets, but they aren't strong enough, and the mini (3mm dia magnets) we have are too strong and would end up attracting all sorts of stuff including any swarf I have in my clothes from my metal lathe.
Finally, no, I don't mark the chart. The only markings I ever put on the chart are the start and end date for the page. I'm too worried about the marker spreading everywhere. I am a fountain pen nut and always carry at least one with me to use, and some of the exotic inks I use tend to take a while to dry & a few smear onto fingers or just spread about a bit. I don't want it to do that onto the threads, as it will inevitably turn permanent the instant the ink gets onto something precious!
Regards,
Richard.