What are your favourite colours for Spanish buildings/countryside? On my previous trips the colours have always struck me as so different to the greens I live amongst in New Zealand!
I'm thinking quinacridone gold * naples yellow * goethite (or monte amiata natural sienna) * buff titanium * van dyke brown * transparent red oxide (or burnt sienna) * transparent pyrrol orange * maybe indian red * potters pink (because I love it) * raw umber * quinacridone rose * maybe pyrrol crimson * hansa yellow medium and light * ultramarine (or French) * cerulean blue chromium * indanthrone blue * maybe phthalo blue green shade and maybe jadeite genuine and green apatite genuine
They are all half pans, except for the ones in italics.
I would be happy to hear your suggestions.
This is an arty question and I'm only a hobbyist at watercolour painting. However, as I live in Spain I paint a lot from photos I take and some plein air stuff.
The greens are always more varied in the wetter areas of Spain, such as Galicia and towns and villages on the Camino del Norte. A couple of yellows (warm and cold) with maybe more selection of blues (warm and cold) will enable you to mix most greens and the extra blues will be useful for the huge skies that you'll be seeing - and when/if you get to the coast. Bring some gorgeous sunset and sunrise colours two, because you will stunned by what those big skies can reveal.
I'd say you might do well to take a small selection of earths and neutrals too. This will help with painting shadows and getting some of those more stone-like shades for buildings and many other facets of the rural areas that you will come across.
There are also marvelous and truly wonderful flowers throughout the Camino routes, so your reds, oranges, pinks, purples, teal blue and some gouache white might be handy too. Quinacridone Gold, Quinacridone Sienna, Perylene Maroon and Rich Green Gold could add a bit of spice to some paintings if you like that approach. Yellow Ochre, Raw Sienna Light, Red Ochre, Transparent Brown and/or Red Oxide can also be tempting to have in your palette. Wait, this palette is now almost the size of your rucksack...
Alternatively, you could keep it minimal with a good set of quality primaries and some earths and neutrals. From that selection you should be able to mix a huge variety of suitable colours. For some artists and sketchers it's more about capturing the essence of what one sees than trying to do a photo-realistic representation. That, of course, depends on the artist and what they like to do.
I seem to remember that there were some posts here by someone who shared some of his watercolour sketches. They were very good at capturing the Camino, often in a very humorous manner. They were more like illustrations than paintings.