The pH of a solution indicates the concentration of free H+ ions in solution on a negative log base 10 scale. Low pH (acidic) means high H+ concentration High pH (basic) means low H+ concentration.
Mistakes. 1  In the manga, Ravenpaw is shown with a slightly altered appearance from his description in the books. 2  He has been mistakenly called Ravepaw. 3  He was mistakenly mentioned with blue eyes.  He is mistakenly called a rogue by Sandstorm in A Clan in 1  Need. He is mistakenly called 'Ravenclaw' by Vicky.
Struan Rodger (Season 4) Max von Sydow (Season 6) The three-eyed raven is a recurring character in the first, third, fourth and sixth seasons. He debuts in person in the fourth season, very briefly portrayed by Struan Rodger, though Max von Sydow takes over the role when the character reappears in Season 6.