Some of the latest I have tried are Mission Gold watercolours from Korea, which were launched a few years ago. They are made by Mijello, who have also created some very innovative palettes. Initially they had a number of fugitive pigments and have reformulated many of their colours. They now have a range of 105 colours, some of which are lovely, but you would have to pick and choose what you might try and read not only the colour name but also the pigment numbers as otherwise you'll get a number of surprises!
Take Burnt Sienna for example. This should be made from PBr7 - though often the transparent PR101 is used - and should be a neutral orange that is useful alone or mixed with Ultramarine to make a huge range of hues, including great greys and deep warm browns.
Mission Gold Burnt Sienna looks like a deep Quinacridone Gold hue - there's no way this would make greys with Ultramarine! It is made from PBr25, PR112 and PY150 - all perfectly good pigments but not burnt sienna PB7. Why? No idea. It's a lovely colour but it isn't Burnt Sienna.
On the other hand - Prussian Blue, also picture left, is exactly what you'd expect - a cool, slightly neutralised blue, made from PB27.
I scanned these in a fairly random order, but you can see Permanent Red (PR112), Permanent Yellow Deep (PY65), Prussian Green (PB27 + PG7), Crimson Lake (PR202), Cobalt Blue #2 (PB28) - this is Genuine cobalt blue, Cobalt Blue #1 (PB29 +PB15:3) - this is a hue that doesn't resemble cobalt blue in any way. Why? Once again, it's not helpful.
Then there are two versions of Ultramarine: Ultramarine Light which is a regular PB29, and a slightly warmer version with PV15 added called Ultramarine Deep. They are not different enough to need both though I prefered the single pigment version.
I've also tried the Lemon Yellow PY3, Vermilion PR112 + PO73, Permanent Magenta PR122 and these all painted out beautifully. The last of this set, Cerulean Blue PB15:3 is a standard phthalo blue and should be called Phthalo Blue - it's nothing like a Cerulean.
Looking at the colour chart, there are very few earth colours that are not a mixture of pigments. Once again I don't understand this. Earth pigments are wonderful and not expensive - why fiddle with them?
What I found interesting though is that these paints claim to have a small drying shift, and they do dry very bright. It makes me wonder exactly what binder is being used as there is normally quite a large drying shift in watercolours.
Update April 2016 - I now have samples of all the 105 colours so will update this blog here and my website soon.
See more watercolour ranges here:
Art Spectrum watercolours here
Blockx full range of Watercolours here
Daler Rowney Artists' Watercolours here
Daniel Smith new colours 2017 here
Daniel Smith full range here
Da Vinci range here
Dr PH Hydrus Watercolours here
Lukas watercolours here
M.Graham watercolours here
MaimeriBlu full range here
Mission Blue full range here
Old Holland full range here
QoR watercolours here
Rembrandt Watercolours here
Schmincke new colours 2017 here
Schmincke full range here
Sennelier watercolours here
St Petersburg Watercolours here
Wallace Seymour Artists Watercolours here
White Nights watercolours here
Winsor & Newton Full range here