4.2.1.13.6 Replace `` the properties of the peroxide '' with `` the properties of the substance '' 4.2.1.13.8 In the text under the formula , delete `` [ - ] '' , replace `` vessels `` with `` shells '' ( twice ) and amend : `` TPO = temperature of peroxide at relieving conditions '' to read `` TPO = temperature of substance at relieving conditions ''