As per dictionary, Surma = antimony ground into fine powder, collyrium.ex-l wrote:"Surma" is some sort of eye wash or decoration (like kohl)? Would you like to explain why this is significant?
It is same as Kaajal, a black paste like thing applied on the inner border of the eyelids.
As per dictionary, Kaajal = lampblack for use on eyes, soot, collyrium.
The line that I quoted is significant because for the first time in the BK literature it speaks about a Bengali guru of Dada Lekhraj. As per PBKs, Dada Lekhraj got the clarification of the divine visions from his partner based in Calcutta. After that he and Dada Lekhraj, along with two other mothers shifted to Hyderabad, Sindh. In the initial days of the Om Mandali, Dada Lekhraj's partner played the role of the Father of the Yagya, i.e. Prajapita/Prajapati (as you have researched). So, it is possible that Dada Lekhraj's partner may have been referred to as the Bengali guru because he came from Calcutta, Bengal's capital.