Can anyone enlighten me as to the suitability of bottles labelled as #7 for developers? I do realize that most developer bottles are #2, but I can't seem to find a 2-litre bottle made of #2 plastic. I have several wide mouth 2-L plastic #7 bottles available, which formerly contained chunky salsa. Glass is not an option; I have several perfectly good 1.89L glass bottles (formerly used for Beau's beer) that I don't want to use. The reason for this is that I just broke a 4-L glass bottle in total darkness, full of D-23; I'll leave the rest of that story to your imagination!