![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjkNr6aXmEeetFRB34VzkDZAdQITZYVUrf20vN2Um1mCPhB2uzFG7QKnrdKpqU4PSfNS4FMM4m7jH9_3L1wuLkfvOzCmMdJPalXsM1EpZNyyl0-qPjNLCuc7sZVcQXv9qyAKav9EgcfDxM/s400/potato+head.jpg)
Observation; pure and simple observation is sufficient to get these colours and the likeness of the head of Solanum tuberosum. How do we derive brown?Simple - You need:1.white2.red3. blue4.yellowWe need to adjust the amount of clay of course to achieve tghe desired brown. :-)Solanum tuberosum = POTATO :-)