What is the material of the calibration board?

[flandrewries]

Hello,
I tried to print the calibre board with the common PP paper which usually used in printing poster,
but I find the reflection of it is nearly same.
What is the actuate material I should adopt?
Thanks a lot.

[flandrewries]

several materials can be use in this work, For example:

1. print with A0 paper and Black powder
2. print with UV Printing method and Car sticker paper
   main idea is separate different material of black and white area.

[xeeboy]

You have to make sure no films on the board when I failed with one been sticked.