Let the milk dry on the paper until your message has disappeared. This may take about 15 minutes. You can make your words come to light by placing your message in a 425-degree oven for 60 seconds. If your message doesn't appear, leave it in a little longer. But be careful, you don't want to leave it in too long and burn the paper.
All milk contains protein.
The heat from the oven causes the protein in the milk to burn. When the protein burns, it turns from white to brown, revealing your words. I will use this theme for 2 weeks. I need activities for art, science, and cooking. Please need help she will be coming into the room to see how this is introduced to the children.