There are more ways to make homemade spy gear than most people could imagine. There are homemade instructions from fingerprint powder recipes to making periscopes. To make fingerprint powder all you need is starch powder, a candle, 2 porcelain dishes, and a knife. You can find step by step instructions at http://www.topspysecrets.com/fingerprint-powder.html. To find out how to make invisible ink .