Before you start recording your colour match accurately, you must understand the limitations of the accurate weight displayed by your scale. If your scale increment accuracy is 0.1grams, it means that your scale will “see”, read or register in increments of 0.1grams gradually. It would not be able to differentiate the weight difference between 0.10grams and 0.19grams. Both these weights would be registered by your scale as 0.10 g. This fact is vitally important in recording the additions of “touch” colours when bulking up to production colours.

	IN OTHER WORDS...
	A sample amount of 100g of colour is mixed where 0.1 g of a “touch” colour is used. This reading falls within the range of 0.10 to 0.19 g due to accuracy of the scale. Now, the scale would only register 0.20 g once the weight on the pan is or exceeds 0.20 g. A production quantity of 10 kg would result in 10 g and 19 g of “touch” colour being added for sample readings of 0.10 g and 0.19 g respectively.
	The difference between 10g and 19g in a “touch” colour in 10.0 kilograms of bulk could be disastrous, as this is almost double the amount of pigment expected given, an initial reading of 0.10 g. This phenomenon is the reason why production colours quite often need additional amounts of “touch” colours added above that which was originally required or calculated in bulking up from sample colours.
	Obviously, if a scale has an accuracy of 0.5grams this ‘discrepancy’ becomes even worse.
	100.0gram sample 10.0 kilograms bulk Scale reading 0.50grams Scale reading 50.0 grams Scale reading 0.99grams Scale reading 99.0grams
	This phenomenon is obviously NOT due to the fact that the scale is inaccurate OR that the matching/recipe system is poor, but is inherent in the accuracy limitations of the scale. You could purchase a scale that registers down to second and third decimal places, but they are extremely expensive, sensitive to drafts and vibrations and are not industrial or robust at all.