There are two simple and useful products to make that use wax : candles and lip balm. You will also want to use essential oils with these. You can make candles simply from soy wax or by mixing beeswax with coconut oil. {i have not made beeswax candles yet, but several recipes call for 1/2 pound beeswax + 1/4 cup coconut oil}. The recipe I used for lip balm was 1:1:1 of beeswax : coconut oil : shea butter. I did 1/4 cup each, added 1.5 mL of essential oil and that filled 25, 5 mL containers, plus some extra.
There are a myriad of topics that you can discuss while you make these things :
Melting points
Vaporization points
Diffusion
Measurements
Color mixing
Environmental sustainability of ingredients
Global origins of ingredients
Trade
Cultural meaning of oils/scents
Cultural uses of candles
Time period switching from candle use in homes to next source
Instruction writing
Marketing plans
Cost analysis
Label design
Geometry of packages
Surface area & volume
The 5 senses
Differing effects of different scents
Pollution (petroleum based vs soy or beeswax)
Conversion between units (such a mix of mL, mg, ounce, cup…)
Books/short stories that have candles as props.
You will need a "double boiler" setup, a pan within a pan. I used a pyrex measuring cup in a pan of water. I heated the water to just below boiling. You will also want popsicle/craft sticks. I used them to stir as well as hold my wicks in place. Soy wax & wicks. That package only gave two wick holders, which is why i used craft sticks. I got about 24, 4 ounce candles out of 5 pounds of soy wax, so I bought some more (without the wicks). Beeswax (you can get yellow if you want, products will have a slight yellow tint to them), coconut oil, shea butter. Containers for candles (i went with 4 oz metal) and lip balm (I used 5 mL). Essential oils are your final purchase. if you are doing lip balm, the smaller, 10 mL , jars are fine (I used 1.5 mL with 3/4 cup of balm and got 25 containers+extra). The candles require more. I did around 10% by liquid volume (300 mL melted wax got 30 mL oil), so you want the 4 oz bottles. There are many brands and I have a couple, but do not notice a difference yet.
Melt the wax, pull off the heat, stir in oil, pour into containers, let solidify.
You will need a "double boiler" setup, a pan within a pan. I used a pyrex measuring cup in a pan of water. I heated the water to just below boiling. You will also want popsicle/craft sticks. I used them to stir as well as hold my wicks in place. Soy wax & wicks. That package only gave two wick holders, which is why i used craft sticks. I got about 24, 4 ounce candles out of 5 pounds of soy wax, so I bought some more (without the wicks). Beeswax (you can get yellow if you want, products will have a slight yellow tint to them), coconut oil, shea butter. Containers for candles (i went with 4 oz metal) and lip balm (I used 5 mL). Essential oils are your final purchase. if you are doing lip balm, the smaller, 10 mL , jars are fine (I used 1.5 mL with 3/4 cup of balm and got 25 containers+extra). The candles require more. I did around 10% by liquid volume (300 mL melted wax got 30 mL oil), so you want the 4 oz bottles. There are many brands and I have a couple, but do not notice a difference yet.
Melt the wax, pull off the heat, stir in oil, pour into containers, let solidify.
Clean up mess. You know you spilled some.
Candle Making video link (jic)