"The color of the book is yellow."
Translation:Το χρώμα του βιβλίου είναι κίτρινο.
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No; for example, if you had a sentence like "Τα χρώματα του βιβλίου είναι κίτρινο, κόκκινο και πράσινο" (The colours of the book are yellow, red and green), you can see that the colours are invariable, because it's just the names of the colours that you write and they're not used as adjectives.
However, if you said "Τα βιβλία είναι κίτρινα" (The books are yellows), the colour does change according to the noun because it describes it and it doesn't just state what type of colour it is.