- Speedball’s Diazo Photo Emulsion is a 2-step process where the photo emulsion needs to be "activated." To activate, the photo emulsion, sensitizer needs to be added. The sensitizer is a very thick oil and needs water to create the right consistency for adding it to the photo emulsion. (The sensitizer bottle will feel unfilled, but don’t worry it is not empty!)
- Product can be messy and difficult to clean up