You have to have a actuall hair color to mix with it. Use 2oz of the color and 4oz of the developer and mix. And apply to your hair
Any brand cream developer can be used with a color as long as it is mixed according to the manufacturer's directions and it is the appropriate volume.
Manic Panic color is meant to be used straight from the container. It is not to be mixed with a developer.
If you mean OREOR® Creme Developer and other brands the main difference is the name on the bottle. For the most part the ONLY difference between developers is what strength (Volume) the developer is. Standard developer is 20 Vol. (6% peroxide) they have Extra Lift 30 Vol. (9% Peroxide) High Lift 40 Vol. (12% Peroxide) And Low Lift 10 Vol. (3% peroxide) and No Lift 5 Vol. (1.5% peroxide) and each is used for a different purpose - Gray coverage, high lift tints, bleaching, streaking/highlighting, tint backs, semi permanent colors and toning. And as long as the correct Volume is used they are interchangeable. That being said: Dedicated Developers are recommended because they have the correct consistency (thickness) special conditioners and or buffers and correct pH for the product being used. All of which can improve or enhance the product performance. For example: most Creme Haircolors DO NOT have a thickening agent in them like most liquid or gel colors so, if you use a developer that is too thin or liquid it will make the product runny. Also, if your color requires a certain pH to give the proper result using any other developer may result in less than ideal hair condition or may cause premature fading. Hope This Helps. Good-Luck!!