Download link: https://app.box.com/s/1c92a8wlo9zgc08r3tai
When vectoring show traces, you may come across semitransparent objects. To vector these properly, you need to find out what colour they are. You can manually go through the process of colour subtraction (writing the formula down, replacing the variables, and calculating the answer for each of the four values), or you could simply download the following program and input the required values. Next thing you know, it gives you the RGBA and hex value of the colour you're trying to figure out.
To find out what the four input colours correspond to and how to get them, please refer to Tran