Amendment regarding submission and opening date of e-Tender no. 21/2019-2020 for supply of 54,000 kgs. Sodium Hydroxide Flake(Caustic Soda), Re e-Tender no. 22/ 2019-2020 for supply of 1,166 packets Green board & Re e-Tender no. 23/2019-2020 for supply of 300 reams Green Proof sheet.