OK, thank you for the information.
Firstly, you seem to have some major misunderstandings about urine and blood glucose. I don't know whether this information came from the book you like, your doctor or another source, but if you rely on the colour of your urine as a guide to blood glucose control, then you will never know what your true blood glucose is.
The colour of urine is dependent on your level of hydration/dehydration. It has nothing to do with glucose levels.
Urine colour may be affected by certain foods (I will post some pictures below, to show what I mean).
Glucose diluted in water or urine is invisible. It does NOT affect the colour of the liquid.
If a diabetic has high blood glucose (at levels over 10 or 11 mmol/l, then their kidneys will attempt to flush the excess urine out of the blood and into the urine. Glucose in urine can be measured using urine test strips but it will only show if the blood glucose is HIGH (10+ mmol/l). Because of this, one of the symptoms of high blood glucose is excessive urination and thirst. Absence of these symptoms does NOT mean that your glucose is at healthy levels.
Healthy blood glucose levels are much lower than that (often considered to be below 7.8mmol/l according to wwwbloodsugar101.com ). So you may have blood glucose levels between 7.8mmol/l and 10+mmol/l and it will not show in the urine, yet those levels are shown (see the website I mentioned) to cause long term and progressive harm.
There is only one way for you to know how much glucose is in your blood at any time, and that is to use a blood glucose meter.
Staring into your toilet bowl may tell you that you haven't been drinking enough, or that you have eaten too many beets, or that you have blood in your urine and need to seek medical advice, but it is absolutely useless for 'divining' glucose content.
Please see the images below for what different colours of urine actually DO mean: