Innovating Science Refill Pack for Forensic Chemistry of Blood Types Kit IS9008

I have used a number of simulated blood typing products and while this one is a great price, the agglutination reaction is very difficult to discern.

I spent $300 of my own money as a school teacher for an activity for my students. They did not work. Very disappointing. Waste of money and class time.

i tried them but nothing coagulate , not even my blood which is A+ , its not working

The agglutination is a little hard to see on certain samples, it basically looks dusty almost, but it works well. The kids just need to know what to look for. Some are more obvious cloudy reactions. The faint color of the blood combined with the light colors of the antibody serums can make it look watery and clear instead of red, but they get the idea of agglutination and how to determine blood type, which is important. It might work to add some more red coloring to the bottles to prevent it from becoming more see through, but I haven't tried it so I can't say for sure. I would definitely recommend this though.