What Is the Difference Between Chlorine Gas and the Red Star?

Hitler says he was blinded by chlorine gas, rather than mustard gas. Hitler asserts that it was yellow cross mustard gas but makes it clear that he slept the night and then went blind. The problem is that chlorine gas is somewhat less likely to blind its victims rather than just killing them outright. While mustard gas often did cause blindness,. British records are not clear on which gas was used; mentioned yellow cross in one story, chlorine gas in another.