MUCH better, Thank you
"Pszemol" wrote in message
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"Peter Pan" wrote in message
. ..
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".