Differences between each Fiber clay.
Fiber clay 504 is great, All ingredients in 201 and 301 clay with silicone transparent powder and controlling substance absorbed oil color deep to the clay when painting and faster oil color are drying. Also, Fiber clay 504 is more knead to more than sticky and softening. Fiber clay 504 is whiter than Fiber clay 201, 301 and has transparent whitening. They are very elastic when dried. The clay can keep up to 5 to more years if put in a plastic bag and secondary put in a plastic zip bag or plastic box with drinking water. This clay molecule is bigger than 201 and 301 clay. Those clay better to better quality changed in keep in a long time.
Fiber clay 504 + wet is upgrading Fiber clay 504. Controlling special whitening and wetting agents to Fiber Clay 504. So the clay is super whitening.
Please come back to read it again and I will update it with pictures.