Separation techniques of heterogeneous mixtures, case of solid solid mixtures, hand sorting, separating a mixture of fresh tomatoes and rotten tomatoes. Fresh and rotten tomatoes are big enough and discernible to be grabbed by the hand. The fresh tomatoes were separated from the rotten tomatoes by hand sorting. The use of a magnet. Separating a mixture of buttons and needles. In this mixture, the magnet attracts only the needles. In order to avoid the need of sorting, the buttons and the needles were separated with the help of a magnet. End of separation techniques of heterogeneous solid solid mixtures.