WHEN you see a picture of the perfect beach it always one thing - stunning white sands. Now travel experts at CV Villas have trawled through the planet's most amazing coastal spots to work out which have the brightest. 4 The Scottish beach was the only UK spot on the list 4 Number one spot went to Tulum beach in Mexico.

The firm, which helps travellers book luxury holiday properties, has used colour analysis theory to rank which beaches have the whitest stretches of sand. Only one UK bay makes the cut - and it's in Scotland . Luskentyre Beach joins the top 20 in 18th place.

The Isle of Harris destination is home to miles of serene white sands and clear turquoise waters - and beat locations in Aruba, Australia and Thailand in the ranking. READ MORE IN TRAVEL OUT-SANDING Little-known Scots beach with white sands and stunning views named UK's best PIPE DREAM Inside the iconic tourist event that attracts thousands to Scotland every year Often compared to spots in the Caribbean, the multi-award winning beach boasts spectacular sand dunes and views over the island of Taransay, famous for being the setting of the BBC’s Castaway. Nearby activities include hillwalking, cycling and kayaking.

In order to work out the rating, the CV Villas team took unedited Google map screenshots of 200 beaches around the globe and used a colour dropper tool to find the RGB code of the sand in each location. This was then cross-referenced with the RGB code of the world’s purest shade of white and th.