Article use
When you say, "mi color preferido es azul" do you have to add "el" before azul.
2 Answers
If you used the el in this situation it might be interpreted as "the blue one."
Between the green and blue dress, which do you prefer? My favorite color [dress] is the blue one. (el azul).
I disagree with Jeremias, however. I think here, blue is representing the shade blue in general. My favorite color is the color blue.
I don't think that the grammar police would arrest you if you used it or not. It would not change the meaning significantly. However, if you wish to make yourself clear add the color blue or the shade blue, etc. (the definite article is often used with nouns that are modified by adjectives)
I believe this answer to be correct. However, I am not 100% positive, and if I am wrong someone please correct me.
In this case you would not use the definite article. Your example is good as is.
The definite article is used with generic nouns. For instance, you might say "El azul es mi color predilecto." However, in this case azul is not generic, it is specifically, your favorite color.
OK, I don't even know if that makes sense. Here is a link to the use and omission of definite articles. However, it does not really illuminate your question.
