re: Thai curry....

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between the red green or yellow....is the difference a spicy level difference or a flavor level difference?

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They are different colors because they contain different ingredients.

Red curry base is red chilies, green curry base is green chilies, yellow curry contains turmeric, massaman contains a blend of spices.

All curries have some chili in them but not all curries have chilies as their base.

As with all food, spice level is determined by quantity and heat quality of chilies.