I do not know what spelkasteru unclear, but I wrote about the technique of holding a candle in the spell and its preparation for the spell. But I will supplement its response to.
White - Purity, purification, protection, for any reason.
Black - Revenge, curse, damage, spell at any cost.
Red - love, happiness, better health, the expulsion of evil. Creativity.
Orange - Engaging sympathies success. Jobs, career.
Yellow - Prophecy, divination, and the removal of barriers of all.
The green-prosperity, material well-being, regeneration. Healing.
Blue - The development and strengthening of psychic possibilities.
Blue - The fight against terror, the protection. Wisdom.
Purple - Strengthening the power of the spirit, the treatment of serious diseases.