Red magic isnt just "a" spell, but it's a means to doing spells. It is something I pulled together as a safe and simple way to study the Fire Element. I spent a year learning about each element, and Fire was a puzzler because of it's risk. I needed ways to learn about it without burning down the house, so I did a lot of substitution-by-association. Thus in the process, I found that Fire's transformative nature is inherent in all magic, because magic by its very purpose transforms. The primary work of magic is to transform the magician-witch.
What follows are the substitutions behind another post I did some months ago called "Red Therapy" that was a long-term, color therapy spell to boost my morale and reinstate my interest in life.
Fire is a symbol of the Universal Energy, what is called Chi, Prana and Orgone. Therefore it is the very universal fluid of change. Red is the color most often associated with Fire, thus also with transformative magic. So I use a lot of red for anything and everything.
A simple candle (any shape or size, but red) is an amazingly effective magical tool. The flame is the power, and the wax is the fuel. The wax is consumed. In this way, a candle is also an offering. We dab on oil to hold the psychic charge of our intention, or thoughts and will, to affix these vital energies to the fuel so that as the wax is consumed, our intentions are released to the ethers by the power of the flame. We roll an oiled (taper) candle in herbs that stick to the oil and reinforce the fire element energies. Olive fruit from which oil is made is associated with fire. SAFETY NOTE: do NOT place an oiled and herbed votive candle into a votive holder. The concentrated heat burns the herbs which can crack or explode a glass holder. Just set votives on a saucer.
Some RED plant-materials are: apple for health & love; carnation petals for vitality; cherry for honesty & psychism; chili peppers for speed; cinnamon for orgone energy, health, success, protection & lust; geranium for exorcism; lily for divine intervention; rose petals for abundance, health, love, psychism; tulip petals for grounding and relationships; yarrow for health & clairvoyance.
Some RED stones are: aventurine for orgone energy & discernment; carnelian as blood healer; cinnabar for money manifestation; garnet for health, vitality, & psychism; granite for strength & stability, & longevity (think of the pyramids); Jasper for health & earth energy.
So fire is a whole system of magic contained and pre-packaged. And using only red ornaments (red glass candle holders, flowers, sparkly things) is eye-candy to the sub-conscious mind. For those of us on a fixed income budget, red magic can serve as the go-to and simplest method of attaining our goals of transformation.