How to do a colour comparison when using the API freshwater test kit

[fateddee]

Dear experience seniors,

Can I check with you all how you do a colour comparison with the test tube and the colour chart?

Do u press the test-tube against and resting on the white background or do u hold the test tube up against but not resting on the white background?
The 2 different methods seem to affect the colour, the colour of the solution in the test tube bring pressed against and made to rest against a white background seem a lot darker then the other method

Which is the correct method to get the most accurate results?

Please advise

[Urban Aquaria]

I usually position the test tube 1-2mm away from the white background of the color chart card, so that light can shine through the test liquid and show the color... i guess if the test tube is pressed against the card, then one side is shaded so it tend to look darker.

Also make sure you check the test liquid color under white light (best if its daylight), as that will show the color more accurately.

[BFG]

Dear experience seniors,

Can I check with you all how you do a colour comparison with the test tube and the colour chart?

Do u press the test-tube against and resting on the white background or do u hold the test tube up against but not resting on the white background?
The 2 different methods seem to affect the colour, the colour of the solution in the test tube bring pressed against and made to rest against a white background seem a lot darker then the other method

Which is the correct method to get the most accurate results?

Please advise

Please do not make use of sms lingo in this forum. Your post will disappear if you continue to do so. Take your time to construct your question and replies, this is not a race, there are no finishing line at the end.

[fateddee]

Hi BFG?
Where is the SMS LINGO?!
Are you referring to u instead of you??? I took my time to ensure there was no lingo as the policy on AQ is quite clear


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[fateddee]

Hi UA,
Thanks for your advice. That is what I have being doing all along but I was afraid I got it wrong. Thanks for your help


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