Before measuring the absorbance of a solution with the ocean optics spectrophotometer, it is important to run a blank sample of to correct for any light absorption not originating from the solute.

I think the most appropriate answer is: the solvent being used in the experiment
To correct for any light absorption not originating from the solute you will need to calibrate the tools with a solution that most similar to the sample.
Blank covete or standard solution can be used, but it was not ideal. By using the solvent as calibration, you can remove the reading from the solvent so your result only comes from the sample.

Ok where is the image ?