after recovery 1 kestose crystals were recovered by the same method as that described above with a purity of 98 and a recovery of 34 1 kestose crystals were further recovered from the green syrup remaining after recovery with a purity of 95 and a recovery of 32 72 of 1 kestose could be recovered from the mother liquor by the above procedure the results obtained are shown in table 3 table 3______________________________________result of recovery of 1 kestosefrom aqueous solution 1 kestose purity of content in 1 kestose recovery green liquor______________________________________mother liquor 90 first crystal 99 36 85second crystal 98 34 78third crystal 95 32 69______________________________________ a mixture obtained by mixing the first second and third 1 kestose crystals obtained by the above method showed a purity of 98 and did not aggregate even if they were allowed to stand in the outside air for 6 months the 1 kestose crystals obtained in example 2 were redissolved in water to prepare a mother liquor with a purity of 98 6 high purity 1 kestose crystals were recovered from the mother liquor by the same method as that employed in example 2 the first crystals had a purity of 99 9 and the recovery was 41 0 the 1 kestose in the green syrup obtained had a purity of 96 7 the 1 kestose crystals obtained from.