🔬 Elevate Your Experiments with Confidence! Non-flammable and alcohol-free for peace of mind. Refillable amber glass for sustainability. Say goodbye to expiration worries! Includes handling suggestions for optimal use. No need for preparation—just grab and go! 500 mL volume 1% solution concentration refillable dropper bottle The Phenolphthalein pH Indicator 1% Solution comes in a generous 500 mL bottle, complete with a 50 mL dropper for easy application. This alcohol-free, non-flammable solution is designed for safety and convenience, boasting an indefinite shelf life and eco-friendly refillable packaging.