The best way to accelerate the bronzing/rusting of weathering steel planters

There are two common ways to accelerate the rusting of Corten steel planters. The first method is hydrochloric acid and the second is a mixture of peroxide, vinegar, and salt. When using either method, you need to ensure that you wear goggles and rubber gloves. Also, make sure that you use the accelerator solution outside in a well-ventilated area and place the planters on grass or other surfaces that with rust stream will not contaminate.

Salt solution:

Mix salt (table salt or sea salt) with water to make a salt solution. Dilute the hydrochloric acid with water until the ratio of water to acid is 50/50, dissolving as much salt as possible in the water.

Apply the salt solution to the surface of the steel planter with a spray bottle or brush.

Place the planter in a sunny, well-ventilated area to allow the salt to react with the steel and speed up the rusting process.

Vinegar solution:

Mix equal parts white vinegar and water to make a vinegar solution.

Apply the vinegar solution to the steel planter with a spray bottle or brush.

Could you let the planter dry and repeat the process if necessary?

Hydrogen peroxide and salt:

Mixing hydrogen peroxide, salt, and white vinegar in equal parts to make a solution requires more time and effort.