Following is our glow-in-the-dark vases. Through countless experiments we have combined epoxy resin and 100% all-natural glow powders to create the longest lasting glow effects possible. Depending on the color of the powder, our vase could still be glowing several hours later. Furthermore, our vases don't require direct sunlight to charge. Depending on the type of bulb and wattage, a vase can be fully charged within 10 minutes. To activate the glow, place under any light bulb 40 to 100 watts; no closer than 6 inches for 5 to 10 minutes (time depending on wattage), turning once half way through, turn off the lights and enjoy. Our vases can literally be charged thousands of times. No batteries to replace! With each purchase you will receive a certificate of authenticity and a general information card; both housed in a semi-firm plastic case and also a product care card. In addition, you will receive a clear lucite easel to display the card of your choosing. In the very unlikely event that a Go-Green Tamarack wood product forms a split, we offer an exclusive lifetime replacement guarantee on all of our wood products.