in the book, Dr.Jekyll and Mr. Hyde how is dr. jekyll's true self revealed

I think that we get to know Dr. Jekyll slowely through the narrative through differen points of view. After learning of Mr. Hyde's evil nature, Dr. Jekyll decides to end the experiment. However, Dr. Jekyll has had several episodes where he turns into Mr. Hyde without the elixir. Dr. Jekyll has also discovered that one of the key ingredients of his elixir was tainted. This unknown substance was what caused the transformation. Without the mystery ingredient, Dr. Jekyll cannot recreate his elixir or control Mr. Hyde’s appearance. For this reason, Dr. Jekyll kills himself when he realizes his time has run out in finding a way to control Mr. Hyde.