You're right Evan. Humbrol, as was, used to be the World leader, with a fantastic, and extremely good quality, range of paints. Their 'Authentic Colour' range was the first of such 'authentic' camouflage colours, and very good indeed. However, since the demise of Humbrol as a company, and the loss of the derelict factory to fire, vandals and the elements, the current owners, Hornby, are obviously using a different source of manufacture. Quite honestly, the paints are nowhere near as good as they were, and must be an entirely different formulation. They not only look different and smell different, but the colours are different too, and the quality, both in coverage and drying, and also in lifespan, are poor to cr*p, compared to how they were. The paints still work, but they often need a lot of patience. Mainly, they are either too thick or too thin, and 'go off' very quickly in the tin, once opened.
I still have some Humbrol paints from over 20 years ago which are still usable, whereas some bought four weeks ago are already going off!
I wrote to Hornby a few months ago, not complaining as such, just bringing to their attention the problems, and quality issues. To date, I have not had a reply!
As I prefer enamels to acrylics, I continue to use Humbrol, as they are the most prevalent, and more conveniently available, and I concede that, with patience and use, they might still do the job. But, there is a definite, noticeable difference in quality and consistancy of product. The silver I mentioned, No11, is now nowhere near the original shade as produced by the 'real' Humbrol factory, and although it gives (to an extent) satisfactory results for some shade requirements, it is no longer possible to obtain a 'true', smooth, even, silver appearance, rather more a 'silverfox' car-body type of silver. I strongly suspect the current range is produced in the same factory as the paints bearing the Revell lable, as the similarities are marked, and this is not to say that Revell paints are no good - but Humbrol were always better.
Unfortunately, until I can obtain a good substitute locally, I'll have to continue to use this ersatz Humbrol!