Closest hex to #19fbff is #1ff

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#1ff

19fbff

19fbff

contains 1f

01f 11f 1f0 1f1 1f2 1f3 1f4 1f5 1f6 1f7 1f8 1f9 1fa 1fb 1fc 1fd 1fe 1ff 21f 31f 41f 51f 61f 71f 81f 91f a1f b1f c1f d1f e1f f1f

contains ff

0ff 1ff 2ff 3ff 4ff 5ff 6ff 7ff 8ff 9ff aff bff cff dff eff ff0 ff1 ff2 ff3 ff4 ff5 ff6 ff7 ff8 ff9 ffa ffb ffc ffd ffe fff

contains 1f

01f 11f 1f0 1f1 1f2 1f3 1f4 1f5 1f6 1f7 1f8 1f9 1fa 1fb 1fc 1fd 1fe 1ff 21f 31f 41f 51f 61f 71f 81f 91f a1f b1f c1f d1f e1f f1f