Your bleach might appear watery primarily because of a reaction caused by mineral buildup, leading to excessive heat and separation of the mixture.
Here's a more detailed explanation:
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Mineral Buildup Reaction: If you're mixing hair bleach and developer and there's a significant amount of mineral buildup present (perhaps in your mixing bowl, applicator, or even in your hair), a chemical reaction can occur.
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Heat Generation: This reaction generates heat. You might notice the mixture becoming unusually warm or hot.
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Separation and Weeping: The heat causes the bleach and developer to separate, resulting in a "weepy" or watery consistency. It might look like water is dripping from the foils or mixing bowl.
In short, it boils down to a chemical reaction due to impurities and too much heat.