Discover the colour in the solution to this sudoku-inspired puzzle

Solve this wordoku in the same way as a sudoku with letters instead of numbers (each of the nine letters in each row, column and nine-square cell). Once solved, one of the overall diagonals can be rearranged to give a pigment that was possibly one of the first compounds to be made synthetically.

This week’s letters are: E I L M N O R S V

 

 

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