Be it television advertisement or printed ad sometimes they are not true and complete. What these ads claim may not be true for everyone and for anyone.
We see in television ads that some condition message is written in bottom area. These messages are related to warning, imagination etc. Like we see Green and Red labels on food products to indicate whether it is Veg. of Non-veg. food item there should be similar symbols/signs used on advertisement. Distinguished either by shape or color by looking at which audience can easily tell whether the claim is genuine or not. These signs can be called claim signs. If everything is correct and possible what the ad is showing then a Green Sign should be displayed on Top Center of the Ad. If it is illusion,