question

A color is evaluated as an array of four components of double values in a range of [0.0 .. 1.0]:

Array[4]: {1, 0, 0, 1}

A list expression of value.color returns such an array for a color of red.

If you pull all values of red items off a list, your query clause should look like for a color field called for example "itemColor":

WHERE itemColor = {Color.red}

Statements in Curled brackets are interpreted as executable Flexscript code in a query string.

If you want to compose a comparable expression from a string for a common flexscript code, you can do this by

item.color == executestring("Color.red")

if you do not need to compose a string dynamically, you can compare logically even by:

item.color == Color.red