[Lua][Help] Need help reading a file

So what I have being done is I'm writing to a file, then reading that and setting it so that what was in the file becomes a variable and then it sets the background color to what was in the file. But everytime I do it I get a Expected number error.
If you could help that'd be very nice.

Here's an example of the code I'm running:

h = fs.open("calcColor", "r")
borderColor = h.readLine()
h.close()
term.setBackgroundColor(borderColor)

And calcColor just reads colors.white

it gets read as a string from the file. so you need to do this.

borderColor = tonumber(h.readLine())

Wait just saw how you write it… gimme sec

borderColor = loadstring( "return "..h.readLine() )()

Thanks works perfectly now

The first method would have worked and been a bit faster if you'd stored the tostring(colors.white) in the file rather than the string "colors.white".