# Recommendations for Infinium Array XC4 reagent use and storage

* The undiluted XC4 reagent ships at room temperature.
* Illumina recommends storing both undiluted XC4 and XC4 that has been diluted with ethanol at room temperature.
* The diluted XC4 can be re-used up to six times over a two-week period for a maximum of up to 48 BeadChips.
* After ethanol has been added to the XC4, Illumina recommends clearly marking the bottle as ‘diluted’ to avoid mix-up with any undiluted XC4 bottles. Cite the date of dilution to track the recommended two-week storage.
* The XC4 reagent bottle label displays the expiration date of the undiluted reagent. Illumina supports its products within the expiration date.

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| *For any feedback or questions regarding this article (Illumina Knowledge Article #1517), contact Illumina Technical Support* [*techsupport@illumina.com*](mailto:techsupport@illumina.com?subject=Question%2FFeedback%20Regarding%20Illumina%20Knowledge%20Article%20#000001517%20-%20Microarray%20\&body=Dear%20Illumina%20Technical%20Support,%0D%0A%0D%0A)*.* |


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