Thanks for the reply Snoozer. But I can't add HCL nor malachite green since it's still in dry powder form and was just about to add it in DI water that's when I noticed that the powder had turned color from white to brown. I think it's a chemical reaction between the 2 powders (K2S04 & MnSO4) since I have about 2 more small containers with the same dry mix and all of them had changed color.
Well I really just wanted to hear from someone who knows more about this.