Winsor Newton's Cobalt Turquoise and Turquoise Light are sister pigments and similar enough I swatched them together. 
Cobalt Turquoise is a blend of blue and green pigments named for the for the semi-precious stone, turquoise. Cobalt Turquoise Light is a paler, slightly greener color than Cobalt Turquoise. My garden boots are the same beautiful greenish blue as Cobalt Turquoise light

 L'Aquarelle by Sennlier makes this sky blue derivation of Phthalo Blue, the organic blue chemists came up with under the name of "monastal" blue. It is a highly complex organic synthesis. Even though Ultramarine Blue is considered the most important blue in a landscape painter's palette, it just cannot produce the blue of Phthalo Blue even mixed with other colors. It certainly nailed the color of the sky over the tulip fields in the Skagit Field on this particularly clear and bright day.

Sennlier L'Aquarelle uses a variant of Phthalo Blue that has a bit of a greener shade. Phtahlo Blue was a pigment that chemists developed with the trade name Monstral Blue in 1935 more or less by accident while creating a dyestuff to replace Prussian Blue. This version has zinc white in it and with a honey binder, is more opaque than most Phthalo blues. It is another interesting color

Winsor Newton Antwerp blue is a transparent blue color. and a softer version of Prussian Blue. It lifts well and would be a nice addition to the palette of a landscape painter for both water and sky.

Winsor Newton Permanent Sap Green is exactly what you would expect from a high quality water color. From their website, "Sap Green Permanent is a rich mid-range green with a yellow undertone." It's chemical composition is similar to other brands of sap green, Phthalo Green or Hooker's green. According to the website "Natural Pigments" sap green was made from the unripe berries of the Buckthorn plant historically. "In medieval times the extracted colorant was reduced to heavy syrup and sold in pig bladders, not as dry pigment." It was the right choice for the parrot feather rendered here.

Transparent Orange is a fairly straight forward pigment by Schmincke . Their Hordam Aquarelle pigments, are created with  unique pouring method that guarantees "that the first stroke of a wet brush captures the maximum pigment load". Transparent orange is an example off the beautiful uniform color, and ease of lifting, and excellent flow properties of all the quality Schmincke pigments from Germany.

Terra Rosa by M. Graham is so much like the color I swatched yesterday, another very reddish brown. This one is, like all M. Graham paints, has honey as its binder, a fact that I was forgetting until I had applied the pigment so densely on the bar marked "mass tone" that it was still sticky this morning. Fortunately it was another very warm day and my studio gets quite warm because its lots of glass. It did eventually dry. I will remember to make sure I check how much binder comes out if I grab another tube that has bee laying around awhile. 
The color is lovely and with a little addition of orange or purple, it offers a full range of warm brown just perfect for this beautiful free ranging cow we encounter on a drive last year.

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Another lovely Holbein color, this brown is reminiscent of root beer straight from the tube. It is a relatively new color and not one that I am familiar with till now. There are other brands that have made Imidazoline Brown but I am unable to find out much information about its components and if it is a new synthetic version of an old organic color that is either no longer feasible to make or harmful to us or the environment. I am sure I will learn more with time. What I can say is that this brand of this pigment lays down beautiful with little effort and lifts easily. What a joy to use it to spend some time with one of the sweet Belgian Mules that used to live under Mt. Si in the meadows of scotch broom before they decided to mow it all done and put up condos. Miss this gals, seven beautiful ladies with blonde manes that shimmered in the sun. 

Holbein makes a VanDyke Brown as does Winsor Newton and both are great for creating shadows, adding depth. I noticed just now that when I swatch tested the other brand of this color, I also did so with a chipmunk as subject matter. I guess VanDyke Brown is then "Chipmunk" colored.