Here's an idea I came up with about a month ago. I have tested it with great results and it seems to be the most effective, safest and by far the easiest way to un-warp Paulson chips.
Here's what you need to do:
1. Clamp the chips in stacks of 20. You will need to use ceramic blanks or similar in between.
2. Put the clamp(s) in the owen in 75 degrees Celcius (167 Farenheit) for 45 minutes.
3. Let the chips cool off in room temperature for a couple of hours while still clamped.
4. Done!
You only have to spend about 3 minutes total per 20 chips. You can easily do 100 at a time (by using 5 clamps). This means that you can unwarp 100 chips and only spend 15 minutes of your own time doing it! This technique removes 90% or so of the warp issue making the chips almost perfect.
Important!
* Whatever you choose to use in between the clay chips needs to be of an uncolored material. If you use printed ceramics the color will transfer onto the clay chips and you will never get it off!
* Make sure you use something in between. If you don't the clay chips will stick together!
* Make sure the temperature the chips are subjected to is not more than 75 degrees Celcius. For example, you should put the chips as far away from the heat source as possible.
* Make sure the chips cool down slowly in room temperature. Do not unclamp them before they have cooled down completely.
* Try at your own risk. I have tested this technique carefully and have no reason to believe that this in any way would hurt the chips. However, I can not take the responsibility for anything that happens because of trying this technique.
Good luck!
Matt