Sorry, the correct name is indeed Liquid Aluminum. Titanium isn't a colour.
Silverstone is/was a Nissan colour, but only used in 1995-1996. I suspect that yours would be Blade or Universal, but it would depend on the year of manufacture as you could fall into either category if yours is a 2004 or a 2005. If its earlier, it will be Blade, if its later Universal.
Noticed a few mistakes in the bar graph so will correct that when I can, probably tonight
Silverstone was used in the US on 350z