This method is actual old. A former hair stylist used to do this with Sebastian 2 + 1 back in the early 2000s. However, back then they did not have ceramic flat irons. She had a plug in flat iron wrapped both sections with the foil.
Sebastian 2+1 and potion 9 is what we used back in the days and it is also a great product to do this technique, I remember those days my mum used the regular iron with the foil I am talking about back in the early 90s the good old days