 So we're back at the Femmes office our tests have been incubating now for about two days We left them at about room temperature So we left them for longer although you should probably incubate them for a day at body temperature But we don't have an incubator here So yeah We're here to look at the test results and see if we have anything that looks like E. Coli in our Delft canal water And hopefully not in our tap water, but we've tested that one as well. So first of all Let's go and look at the collider test. So I am taking out the tubes now both of them Appeared to have a yellow coloration. So what does the yellow mean? So yellow means there's some type of Colliform in it. If it was clear then no coliforms present So in order to see if these coliforms are E. Coli or not We need to go and view the solutions under UV light. So let's go into our dark room Follow me So here we have our little dark room set up because the lights do not switch off So what I'm going to do is just place the UV light inside this cupboard and as you can see it's already progressing And I'm gonna place both of the samples on top I will place the tap water on the left and then the water from the canal on the right So it seems to me that the test tube on the right is florescing slightly under UV light Whereas the one on the left definitely is not So is the one on the right the Delft canal water? Yeah. Yeah, and on the left is tap water So seeing as it was both yellow, but the one on the right is florescing under UV light That indicates we probably have E. Coli in the Delft canal water, but not in our tap water So perhaps we can go back now to our station and look at the second test, which is the petrofilm test So petrofilm test we have prepared these two petrofilms So first of all if we just look at the tap water sample, it's pretty clear So there's no bacteria growing in there But on the contrary if we look at the water from the canal There's definitely colonies growing in there. So as you can see most of them appear Reddish so we can say that these are non-E. Coli coliform colonies, but there are maybe two or three blue colonies showing up here. It means that the blue colonies are E. Coli colonies from the canal water. And that matches up with the florescence we saw in our Delft canal water sample Whereas the HGO from the tap have no florescence So we think in the Delft canal water there is some E. Coli and so we should not drink Delft canal water. Yeah, essentially, but those results kind of Align with what we expected, right? So tap water some things in it but nothing too dangerous canal water lots of stuff in it some of it potentially dangerous