Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

The Board of Directors

Olin Corporation:

We consent to the use of our report dated February 24, 2009, with respect to the consolidated balance sheets of Olin Corporation as of December 31, 2008 and 2007, and the related consolidated statements of operations, stockholders' equity and cash flows for each of the years in the three-year period ended December 31, 2008 and the effectiveness of internal control over financial reporting as of December 31, 2008, incorporated by reference in this Registration Statement on Form S-8.

Our report with respect to the consolidated financial statements contains an explanatory paragraph that refers to Olin Corporation’s adoption of the provisions of Financial Accounting Standards Board’s Interpretation No. 48, Accounting for Uncertainty in Income Taxes, in 2007, adoption of the provisions of Statement of Financial Accounting Standards (SFAS) No. 123 (Revised 2004), Share-Based Payment, in 2006, and adoption of the provisions of SFAS No. 158, Employers’ Accounting for Defined Benefit Pension and Other Postretirement Plans, in 2006.

/s/ KPMG LLP

St. Louis, Missouri

April 24, 2009