To make plaster from iron oxide, follow these steps:
Preparation materials: iron oxide and gypsum powder. You can purchase these materials at a chemical store or online.
Mix iron oxide and gypsum powder in the required proportions. Depending on the color effect you want, adjust the amount of iron oxide. Generally speaking, adding 10% to 20% iron oxide pigment can achieve good results.
Add the mixture to an appropriate amount of water and mix well with a blender or hand mixing tool. Note that the amount of water should be enough to turn the mixture into a thin paste.
Wait until the mixture becomes slightly thick, but still manageable. This can take anywhere from a few minutes to half an hour, depending on the type of plaster used and the temperature.
Once the mixture reaches the right consistency, you can pour the plaster solution into the mold and wait for it to set and solidify. Depending on the plaster instructions, this usually takes anywhere from a few hours to a day.
Once the plaster is fully cured, you can carefully remove it from the mold and apply additional embellishments or treatments, such as grinding, painting, or other coatings.
The above are the basic steps for using iron oxide to make gypsum. Please refer to the instruction manual of the gypsum powder used to ensure correct and safe operation.