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The Amendment Cycle of the IMDG Code
Principles of the IMDG Code
Each Amendment is valid for up to three years.
There are alternating years for implementation.
In January of the yellow years, a new Amendment is published and can be used immediately, subject to the timing of National Competent Authority adoption.
During the yellow years, the preceding Amendment can also be used, so it is a transition year.
In the green years, only the current Amendment may be used.