Last time I saw individual blood cell under foldscope. So I thought about cheek cell. I took a cotton bud and little saliva from my cheek and put it on a glass slide. I used blue food colour as dye. Then put a cover on it and put it under foldscope.
I was quite happy with the results though It is a temporary, I can’t store it.
PS: If anyone know how to prepare a permanent cheek cell slide please lat me know.