No these do not have sample on them!!!! I have another pair that i will be posting later this week... the other pair of contacts that i have are GRAY!!!
Yes they can be dangerous if there not used properly!!! When using contacts you need to make sure they are kept clean ( you will need solution). You also don't sleep with them you take them out every night and sanitize them in solution before putting them on and after taking them off. They need to be keep in one of those contact round holder things! (sorry dont know what there called). Hope this helps!!