I bought a cast iron skillet and after washing it and then heating it I got a color like rust
I bought a cast iron skillet and after washing it and then heating it I got a color like rust from fire side
After washing by Dishwashing soap I dry it by tissues, then heat it over a high temperature
Now I season it
Is healthy using it with this color ??!!
I have no experience dealing with this type of fryer
Now I season it but is healthy using it with this color 
Best Answer
This has happened because you didn't dry it thoroughly enough.
I would advise starting the seasoning process again. This is a good visual guide from Joshua Weissman: https://www.youtube.com/watch?v=PDTCgxvmShc
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Quick Answer about "I bought a cast iron skillet and after washing it and then heating it I got a color like rust"
Make sure you have covered the whole cooking surface with salt. Let the salt remain for a while till it starts getting a pale yellow/brownish colour. Add a small amount of water and this makes a white salt coating on your skillet. Turn off the heat and let it gradually cool down.Is it safe to cook in cast iron with rust?
In fact, with a few simple tools and a little elbow grease, there are plenty of ways to thoroughly remove rust from cast iron. Experts at the University of Illinois at Urbana-Champaign agree that a little bit of rust on cookware isn't likely to harm you. (Even rust in drinking water isn't considered a health hazard.)Why does my cast iron skillet look rusty?
Without the protective layer of carbonized oil called seasoning, cast iron is susceptible to rust. Even a well-seasoned pan can rust if it's left in the sink to soak, put in the dishwasher, allowed to air dry, or stored in a moisture-prone environment.Is rust in cast iron pan harmful?
Rust sometimes varies in shade, so your cast iron pan may very well be covered in corrosion. Rust is hazardous because if consumed, it can lead to tetanus, but only if it has been around the bacteria Clostridium tetani (via Fox News).Is cast iron ruined if washed with soap?
So here you go, once and for all: Yes, you can use soap on cast iron. It's totally fine on enameled cast iron, and on plain cast iron, too. It's not going to destroy your seasoning. With enameled cast iron, you're done: Wash and dry.Rusted Cast Iron Skillet Restoration.
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Answer 2
What you're describing is actually pretty typical for a cast iron pan that wasn't "pre-seasoned".
Basically, you washed off the protective layer that was in the pan for shipping, and then applied high heat which sped up rusting.
I would recommend at the very minimum, a scrub with a steel brush or steel wool to get off the rust, rinse it off, dry it (with paper towels, or a towel that you don't mind getting stained), lightly coat the bottom in oil, and heat it in an oven (upside down, so it doesn't drip too much and/or stick to the oven shelf) and rebuild the seasoning.
Answer 3
Cast iron skillet generally develops rusty surface if you happened to cool it down by running under tap water. Cast iron should be allowed to cool slowly. It may also be the case that you didn't use any oil in the beginning.
You can wash the skilled and do the seasoning again. I follow below steps to season my cast iron skillets which are used for making thin rice crops (called as Neerdosa in Karnataka, India)
First step: Pour in dry salt and slowly heat the skillet. Make sure you have covered the whole cooking surface with salt. Let the salt remain for a while till it starts getting a pale yellow/brownish colour. Add a small amount of water and this makes a white salt coating on your skillet. Turn off the heat and let it gradually cool down.
Second step: Brush oil all over the pan and turn on the heat. Once the oil starts smoking, turn off the heat and then keep it for cooling.
This is a good starting point. You can now start cooking and remember to oil or water whenever you are cooking. Keep coating the skillet with cooking oil once in a while to avoid oxidation and formation of rust.
Sources: Stack Exchange - This article follows the attribution requirements of Stack Exchange and is licensed under CC BY-SA 3.0.
Images: Kübra Arslaner, Erik Mclean, Magda Ehlers, Milan