Until we started using solvents, bubble hash was the most popular kind to find. It’s easy to make and the yield is pretty good compared to kief or finger hash. It just requires water, ice and bubble bags to make bubble hash. The weed is agitated with the water and ice to get all the delicious trichomes to fall off. They are then filtered through the micron bags.
Depending on the grade, the colour can change. As a general rule, the lighter the colour of the bubble hash, the better it is! The better it has been filtered, the less plant material that ends up inside the final product. What remains is a pretty decent solventless hash product.