Something like ~6 months ago I bought a bottle of Silvergrain Tektol Neutral to eventually
test it, which I did over the weekend. I kept the bottle as recommended and I never opened
it until this weekend. I then transfered the rest of the bottle in non-pyrogenic 50ml polypropylene
conical tubes (nice to work in a place with a lot of labware!) which when filled to the rim contain ~57ml.
Things is that when the tube are filled up and put in reverse on their cap a little bit of air is still trapped
at the tip of the cone. Now after a few days I can see some deposit in the tube and there some stuff
in suspension. Normal?