Pos Malaysia released a set of 10 stamps entitled Musea and Artifacts on 31 August 2013. The stamps were sold at post office counters nationwide on 2 September 2013 because 31 August 2013 was a holiday. I was a bit surprised when I saw these stamps at the post office counter as the artifact images on the stamps were masked by black ink, and I only came to know later about the thermochromatic ink (black ink) is being applied on the stamps. Well, the innovative feature (thermochromatic ink) used on the stamps is definitely not in my favour - it makes the stamps look ugly.... and that I am still figuring out how to really view the artifact images (behind the thermochromatic ink) properly without damaging the stamps.... really awful.