What Color Watercolor Blue To Paint the Mediterranean?

We visited the Cinque Terre, the 5 towns that overlook the Tyrean sea, a portion of the Mediterranean yesterday. You can hike between some of them or take a train or boat to visit them. 

Rona in front of the shoreline at Monterossa. 

Rona in front of the shoreline at Monterossa. 

We took the boat to see all the villages from the ocean looking back. I have never seen such colors of blue and the colors were constantly changing.  

When you travel with other painters you always have someone to discuss paint colors with. Dave suggested mixing different blues together, I want to use colbalt turquoise light and marine blue and French ultramarine blue and perhaps thalo and viridian with a touch of scarlet lake. 

 

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What color(s) would you use?