Those are real grains on the stamps and the other two are authentic Thai silk material used on the stamps. Of the six stamps only one stamp's got the grain missing on it. Shows how well the grain has been stuck to the stamp. Love the stamps
The Thai silk stamps. This is the one in blue. The other ones in gray.
And the Vanuatu cover
Beautiful Champagne Beach stamp. The clear cancellation shows that the cover came from Port Vila and was sent on 08 Dec 2011.
Do feel free to add your thoughts, comments or suggestions
NOTE: Please click on the images for a larger view / closer look.