Brake and Clutch Fluid

With changes to the brakes pads, shims and possibly calipers coming up depending on what happens when I investigate a slight bind in the left front near side wheel. I thought I would check the levels of the fluids as I will have to get some top up stuff. I had seen this triangle warning sign cable tied to the brake pipe before but hadnt really paid it too much attention until now. The lable reads use only DOT5 silicone fluid by Automec. Now I thought that DOT5 was purple in colour but the stuff in my master cyclinder is clear. So now I need to investigate whether this stuff can change colour and how to test to see whats in there. Now I  know that DOT3 and DOT4 will eat your paintwork but I think thats a bit of a drastic test and I understand DOT5 repels water so I think if I add some DOT5 from the master cylinder in a jar with a little water they shouldn't mix and this will clarify that its DOT5 and has just gone a bit pale for some reason. I have heard that light can have an affect but no light can get to the fluid until you take the cap off so the jury is out on that one.

You can see the warning sign attached to the pipes