Who ate the teacher’s lunch?

Who ate the teacher’s lunch?

Lunches have been going missing from the staff room, especially the cheese sandwiches. Use chemical reactions to reveal the invisible ink code that will unlock the security footage and write what you have learnt on the worksheet

Using the invisible ink you have made, write down who you think ate the teacher’s lunch on a piece of paper. Think of it like writing down the first suspect you would interview. You will come back to this later. 

Reveal 3 hidden numbers on the Code Card using a turmeric solution and work out all the possible combinations using those 3 numbers. One of the combinations will unlock the padlock that holds the security footage of the lunch thief. 

Here is a short video about this challenge.