I placed the candle on a glass plate to protect my table, and then lit the candle.
After a few minutes, I could see that the candle burns inward. Meaning that the wax pooled in the center rather than running down the sides.
Then I got impatient waiting for it to burn! So I took the flame to the spot that we wanted to test - the tissue paper.
No fire! It did discolor the tissue a little bit - but I would have no worries about burning these stamped candles.
Hope this helps you and your decision about burning your pretty stamped candles! Especially the candles that burn inward.