<p>Over the past few decades titania has been significantly contributing as the fundamental constituent of pigments used all over the world. Chloride and sulphate processes are the established methods for the pigment production. The sulphate process is preferred over the dominant chloride process, which has the demerits of high capital cost and energy requirement as well as requirement of high TiO₂ feedstock. However, the iron containing by product of sulphate process is environmentally detrimental solid effluent. Several efforts have been carried out to lessen the iron fraction in the sulphate route feasible feedstock. Of these, removal of iron in the non-acidic medium is preferred as it significantly reduces acid consumption and hence acidic effluents while retaining the acid solubility of newly formed phases. The carbothermic reduction of the TiO₂ precursor at low temperature results in the conversion of ferric iron to ferrous and metallic iron as a shell over acid soluble titanium bearing core constitutes of Ti²⁺ and Ti³⁺ ions. The advanced method for the removal of iron is aeration rusting strategy after the reduction process. It eliminates the iron fraction in the non-acidic medium at low cost meanwhile retaining the stability of the newly formed acid soluble phases unaltered. Here a review of the literatures on the synthesis of acid soluble titania phases for sulphate process has been made. Tetravalent Ti is highly stable whereas trivalent and divalent titanium ions are reported to be readily attacked by acids. Low temperature reduction and addition of impurity oxides in permissible levels are reported to yield lower oxides of titanium. This article highlights various efforts carried out so far in order to form the acid soluble phases of titanium oxides favorable for the environmentally benign sulphate route pigment process.</p>