Hi there. So in this week's experiment we're going to visit the visible absorption spectrum of three dye compounds. We're going to use that spectrum to show how you can pick wave lengths from parting a box model. So what we've done here first is we've simply weighed out, as you see, weighed out some of our first dye compound. And now we're getting the solvent ready, the ethanol solvent that we use to dissolve the dye. So, here we are transferring the solvents into the dye. You can see the solution. The pinkish solution for dye one is starting to form. So now you gently shake that to make sure it's all dissolved. And you can see the pink color more clearly now. So now, you repeat that for dye two, compound two, as shown here. And you can see that this is forming a blue solution. And then also for diet three, compound three, and this forms a green colored solution. So now you've prepared your dye solutions, and also on the left here you can see that you have also some blank solvent. So now you're transferring these solutions to these little bottles here in front which are called cuvettes and they're going to be used in the spectrometer. So you fill up each of your cuvettes with the dye solutions as shown here on the right for the blue one. So now you replaced the cap, and you do that for all the other two, including the blank on the left that's shown here. So these are now ready for their spectrum to be recorded so you go to the spectrometer. Which is shown here. You open the door to the sactile compartment. When you can, you see there are a number of slots for your samples. So in the first slot as shown here we put the blank in first. And then, in slots 2, 3 and 4, we're gonna put our 3 dyes. So now you close the door and you're ready to go to simulation to record the spectra of the three dyes.