Herbal sunscreen - make-it-yourself recipe!

I've had quite a few requests for an all natural herbal sunscreen.  We've been experimenting with a recipe here, testing it out and tweaking it to use ingredients that are easily available.  I'm really happy with the results - a nice thick creamy spreadable sunscreen that absorbs well and doesn't feel sticky.  It has natural sunblock (sesame oil), soothes the skin (cocoa butter), has natural antiseptic qualities, smells lovely, and is easy to prepare.  We hope to have this available in our etsy shop at some point this summer, but for now here is our recipe so those of you who like to experiment with all things herbal can make it at home yourself!  Our recipe is based on one from an old issue of Mother Earth News magazine, modified it to suit our needs.  Here's the recipe:

Herbal Sunscreen - safe for kids (use externally only, and reapply every few hours)
70 grams organic sesame oil
45 grams organic cocoa butter
15 grams pure beeswax
110 grams (4 oz) strong green tea
2 Tbsp zinc oxide
1 tsp vitamin C powder (or other natural preservative)
10-20 drops pure lavender essential oil

1) Melt sesame oil, cocoa butter and beeswax in double boiler or in a small saucepan on the stove over low heat.
2) Remove and add green tea, zinc oxide, vitamin C powder and lavender oil.  Mix well with a stick blender until creamy.
3) Store in glass jars or other small containers with tight fitting lids (or reuse an old sunscreen tube).  Keep in cool location to keep in thick spreadable condition (or firm sunscreen back up if necessary by placing in the fridge for half an hour).