There is "the truth" as a concept, and "a truth" of particular references about "the truth" i.e. reality. The notion of "shades of truth" is either from a misunderstanding of the word truth and how it is used to reference reality as a whole (uni-verse) grouping order concept, or as a reference to specific instances of reality that can be objectively discerned.

This confusion is made popular by the post-modern academia which is philosophically lost in cul-de-sacs of vapid thought.

The result is people don't understand the words they use or how they were created to reference reality. Truth being one word that people don't understand very well at all. I have done extensive etymological and philosophical work to expound on what truth is and it's importance to consciousness. Existence is where truth can be verified, and it matters.

There are many truths, as many as there are properties, attributes and characteristics that can differentiate one thing from another. It's immense how much truth and complexity there is in existence for us to understand.

What is Truth - The Importance of Truth in Life