Have noted some discussion regarding sealed containers and CS in the past, 
(sorry but I didn't follow the conversation all that closely.......the light 
bulb has just started to flicker), and have just realised what may be going on 
with my CS.

I have a 1 litre, (don't know what that is in ounces, about 1/3 of a gallon? ), 
clear bottle with a glass stopper and several other clear glass containers 
which have screw tops with rubber inserts and I have noticed that the glass 
bottle always has silver plating out on the glass and the CS goes a pale golden 
colour while the other ones, with the screw tops, stay clear with no plateout.  
The discussion a while ago regarding 'air' has just made me see that this is 
what's probably going on with my CS.  I haven't bothered about it at all in the 
past, but did wonder why this bottle always changed compared to the others.  
Like I said, I have never really concerned myself over this and have just put 
it down to 'one of lifes mysteries' and only now see that CS should be kept in 
an air-tight container........yes?  Not looking for an indepth analysis but 
this sounds like it could right.........yes?

I usually use 40ml, (think that's approx 1 ounce), as a starter when producing 
a new batch and it may be this particular pale golden CS which results in 
colour, (can't distinguish what colour other than clear though as it's so 
faint, maybe green, I think green comes before any yellow hue), in my 'new' 
batch on occasion.  I rotate about 4 or 5, one litre containers and it's a 
while till I get to the glass one with the glass stopper.  Need to take note 
the next time I use this 'coloured' batch as a seed and see what happens with 
the result.

It's OK, I've just never concerned myself unduly with the 'science' of CS in 
the past that's all, I usually just 'make it and take it'.

Neville.