The nature of the boron·carmine complex in solution is established· by three methods. These were the method of continuous variations by Job and modified by Vosburgh and Cooper, the mole ratio method proposed by Yoe and Jones, and the slope ratio method of Harvey and Manning and modified by Venkateswarlu and Raghava Rao. The results obtained by the three methods indicate that the empirical formula of the boron complex is two atoms of boron to one molecule of the reagent
