Question: I recently had a project delayed. The print rep said the delay was caused by gas ghosting. He never full explained the problem. What is gas ghosting?

Answer: Gas ghosting, also known as gloss ghosting, is the transfer of a printed image from the front of one sheet to the back of another. The transfer is caused by a chemical reaction when vapors from ink drying on one side of the press sheet interacts chemically with dry ink or paper coating on the other side of the sheet. Gas ghosting can also result when the ink drying on the second side is accelerated or retarded by fumes given off by ink on the first side. The problem is typically solved by changing the chemical properties of one of the variables in the process.