If you want to remove the copper circles, and decorate the cheesecakes ahead of time, simply place them back in the freezer until time to serve. When adding the different colors of cheesecake to the copper circles, smooth the cheesecake batter out as much as possible to the edge of the circle, all the way around, so that you have smooth layers when the copper circles are removed. ALSO: The copper mats used to form the circles will not stick to the cheesecakes. They are copper grill mats, but we found them to be a good tool for mini cheesecakes. If you have Pastry molds, or stainless steel plating rings, you can use those instead. When you cut the copper mats to form the circles, or rings to form the cheesecakes, you may have pieces that you'll need to tape together to make another circle. You can also use doubled pieces of Parchment paper to make the circles, and tape them to secure them for the cheesecakes, but we found the copper mats to be substantially sturdier than the paper. Again, if you have pastry molds, or plating molds, those are usually Stainless Steel, and will work great for the mini cheesecakes, since they're cylinders with no top or bottom, and slide off the cheesecakes easily. Also, you can get silicone cylinders, but we found those didn't hold their shape as well as the others. FOOD COLORING GEL - you may need 2 or even 3 drops of food coloring gel to get the color in the photos. If you feel your color isn't bright enough, add another drop of food coloring gel until the desired color is achieved.