Welcome Anish,🤗ya lovely moment.Its not done by thumb,its done by either coin or ring,as far as i know.Don't know about the actual logic but when i get to know,i'll tell you,i guess its symbolic as for prosperity,not sure though.No prob.you can ask anything buddy.😃
Oh wow lovely moment 😳
Thanks for the info deepti 🤗
Y they r using ring for sindhoor can't they apply it by with groom's thumb
Sorry to ask this I donno anything abt these rituals and all.