My trick for adding multiple colors of ink to a Silhouette Mint stamp is to add a single color of ink, let it absorb, blot off most of the excess
Multi-Color Mint Stamps - Finding Time To Create
Multi-Color Candle Stamp
1394 - 1971 8c Dwight D. Eisenhower, multicolor - Mystic Stamp Company
Silhouette America, Silhouette Mint Custom Printer (White) 4x4 : Office Products
Silhouette Mint™, Three Stamps Your Kids Need
Sizzix Stencil & Stamp Craft Cardmaking
10+ Silhouette Mint Tutorials, www.kimberdawnco.com
Multi-Color Mint Stamps - Finding Time To Create
Mint Stamp Maker - Silhouette 101 Class - Finding Time To Create
Minting a Stamp
How to Use Silhouette Mint & Make a Multi-Colored Stamp
Multi-Color Candle Stamp