article_snippet: A dog walker who spent two years thinking he owned a £100,000 piece of rare whale vomit has discovered yellow-grey rock is actually worthless.
article_snippet: But Ken Wilman dream of netting a small fortune has now been shattered after an expert in U.S U.S revealed the 'stone' is not authentic ambergris - and has absolutely no value.
article_snippet: An expert in U.S believes that yellow-grey rock has absolutely no value and is not authentic ambergris .
article_snippet: The 52-year-old was walking his boxer dog Madge along the beach in January 2013 when his stumbled across what his believed to be the rare item.
article_snippet: But the true value of the stone was discovered when documentary maker Peregrine Andrews -- who produced a Radio 4 show called Ken, Madge and the Strange Rock following the find - sent a sample to an expert across the Atlantic.
highlights_snippet: Ken Wilman found yellow-grey rock while on the beach with Ken Wilman dog Madge .
  
highlights_snippet: But U.S expert said the rock, found in Morecambe, Lancs, is not ambergris .
  