Hey @blujeenz, the ink comes in a precision tip plastic bottle, similar to some of our juice bottles. I just put a few drops on a normal dish washing sponge, dabbed it on the area of the door and exposed to a flame. I found that i got better control of the ink pattern with a sponge. 
You could also use this.

	
		
			
		
		
	
				
			You could also use this.

 
						 
					
				 
  
 
		



 
 
		




 
 
		









 
  
 
		 
 
		 
 
		