Factor Red Colour Enhancer Concentrate 100gPasswells Factor Red Colour Enhancer Concentrate for use with a wide range of birds. Factor Red is a concentrate powder containing a minimum 10% Canthaxanthin. Make up as a stock solution which can be diluted with drinking water or mixed with soft food. Size: 100g To make stock solution add 25g Factor Red to 500ml boiling water mix until dissolved then make up to 1 litre with more boiling water. Store in refrigerator. For use in drinking water supply