Phenolphthalein pH Indicator 1% Solution — 250 mL (8.4 fl oz) Bottle Plus 1 Dropper Bottle containing 50 mL of Solution

I used this for a classroom activity to help show STD and how they can transmit from one person to one person. It worked great and was easy to use.

Yes, phenolphthalein is an odd choice, but I needed some for a science experiment. This arrived promptly and worked as expected. Happy with my purchase!

Worked well since the shipment from usual supplier would not have come in time

I recieved the chemical on time as expected. And more importantly it works perfectly. Maybe I shouldn't be too pessimistic, however the first bottle I purchased 2 years ago didn't work as expected. This bottles color is bright magenta when reacting. The bottles seam to seal well. My old bottle worked well for about a year, then evaporated to almost nothing in 2 months. Time will tell. I will update this in a year.

I purchased this for a school science demo. It worked exactly as it should.

I have a YouTube channel called DIYscienceguy where I combine craft projects to teach science lessons. I have a craft using this solution to change the color of different liquids depending on their pH. This solution caused a fast reaction that WOW’s kids. Very effective.

As advertised

This indicator works very well. It has a dynamic color you can't miss. The color change indicating property are nice and sharp, usually within one or 2 drops of the active chemical. The bottle is larger than expected, so I'll be in phenol for quite some time.