Hello,
We have a product: electrolyte powder. The powder needs to be added to water to create the beverage.
The electrolyte powder contains (natural) colourings, but there is variation in terms of color between batches. I'm working on setting up a method to decide how much the color of the beverage can deviate in order to still be acceptable.
We don't have a colorimeter or spectrophotometer so we cannot use those devices.
Does someone has ideas of how to test this/ have a good test method in mind?
My idea was using color cards and keeping this color cards next to the sample and see if it's still acceptable or not. We do of course need to decide how much lighter / darker the sample can be in order for production to be released.
Any ideas are welcome!