Renewable energy sources are mainly the Sun, Wind and Water. Today's conventional energy sources may exhaust one day but renewable energy is not depleted upon usage. It is natural, harmless, economical and good for the environment.
Liechtenstein Post has issued two series of renewable energy stamps, one in 2010 and the other in 2011.. Below is the second series of renewable energy stamps. I heard that they used Thermochromic ink in this stamp and if you apply heat on the area, the colour will change.
But I couldn't see the change at all. I purchased it from Liechtenstein Post directly. Is there anything like only in miniature sheet it will work or any other hidden thing. If anybody know the answer please clarify.
Liechtenstein Post has issued two series of renewable energy stamps, one in 2010 and the other in 2011.. Below is the second series of renewable energy stamps. I heard that they used Thermochromic ink in this stamp and if you apply heat on the area, the colour will change.
But I couldn't see the change at all. I purchased it from Liechtenstein Post directly. Is there anything like only in miniature sheet it will work or any other hidden thing. If anybody know the answer please clarify.
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