IS THERE A BETTER TEST KIT

MUCH better, Thank you
"Pszemol" wrote in message
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"Peter Pan" wrote in message
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You have to many typos and incomplete
sentences for this to make and sense

Well, English is not my native language...
Which part of the text is not clear for you?

Hold the vial very close to the white paper
and then you notice that it casts a color shadow.

So when a vial is too close to the white background,
the background changes color from white to orange
(NO3 tests) or whatever other vial color is...

Result: you need to hold the vial not too close
to the white background for it to stay really white.
Get it now ?

BTW - you made a typo yourself: "to make and sense".

I use these tests and I follow instructions and compare colours holding sample vial over WHITE background. To get WHITE background you CANNOT put the vial right at the colour scale because your will cause the white ambient light go through the colour vial once, then hit the white background colouring it, and go back toward your eyes. In effect you are watching at the test tube placed on the already coloured background with the colour light shining through it.