Here below is the official statement about INR18650-25R tube color changing from Samsung SDI.
“This official letter from Samsung SDI is to assure you that
We hereby guarantee INR18650-25R (Green Tube ) cells meet the same quality Standards ,
Cell characteristic and safety as INR18650-25R (Blue Tube )
And , We will be unified into a color (Green Tube) for INR18650-25R in the future”