"When Ibn 'Umar burned incense he would burn Al-Uluwwah that was not mixed with anything else, or camphor mixed with some Al-Uluwwah. Then he said: 'This is what the Messenger of Allah [SAW] used to burn.'"  

هَكَذَا كَانَ يَسْتَجْمِرُ رَسُولُ اللَّهِ ﷺ