Color Blocks at Candleworks are oil soluble dyes, which you can cut with a knife to use with your candles.
Please note that the concentration of the colors varies by types of wax. (Natural waxes require higher proportion of dyes compared to paraffin waxes.)
You can achieve more various colors when blending different liquid dyes together. Likewise for color blocks.
One block of color block is enough for 7kg candle (based on the median color standard). Make sure to test in advance with a small amount to achieve your preferred color.
Candle Dyes cannot be used for other applications other than candles.