I know i'm a little slow responding to this post, but I'm just catching up on the posts from the last month or so.
I've been struggling with the question of when the wine is fully clarified for a long time. My usual process is to take a 6 gallon batch that has been clarified and when it appears to be clear, rack it into a 5 gal carboy and a 3liter or 1 gallon jug. The idea is that the 5 gallon carboy will get the wine from the top of the carboy where the wine was clarified so it should be the most free from sediment, while the 1gallon jug takes the risk of getting a bit of lees from the bottom of the clarification carboy. Next step in the process is to wait a week or 2 and see if any sediment forms in the 5 gallon carboy. If no sediment forms and the wine looks clear, it's ready to bottle.
With my current batch of wine that's clarifying, I found a week or 2 ago that it appeared to be clarified when observed in normal room light, but if I looked carefully, I thought I could see some suspended small particles in the wine. After several minutes of careful observation and cleaning the outside of the carboy to make sure it wasn't an optical illusion from dust on the outside of the carboy, it occurred to me that I should be able to illuminate the particles suspended in the wine if I used a strong flashlight. So I took a strong flashlight turned it on and pressed it against the carboy, and the suspended particulates shone like stars on a clear night (ok , slight exaggeration, but you get the idea). Clearly too early to rack, so I started running the flashlight test every day or 2 (takes 10 seconds), and watched as over days the night stars turned into a milky narrow pencil sized beam. I know what I'm observing is light scattered off the flashlight beam from suspended particles in the wine. I'm thinking a laser pointer might work even better.
The wine kits I use (VR) recommend (rough paraphrase here as I don't have the directions immediately available) that you put a sample in a wine glass, and look at in under good light, and see if it is sparkling clear. I'm wondering if my flashlight/laser test might turn into a better test that is less subjective, cheap (most people have a good flashlight), and less invasive (doesn't require stealing some wine from your topped-off carboy to put in a wine glass under good light).
Any thoughts?