Sentence:  Scent the entire batch and then color half with the blue colorant. Pour both parts back into your soap pot. Do not stir. Pour in a circular motion into a block mold. The pouring action will cause the soap to <WSD>marble</WSD>. 
Meaning of the word marked with <WSD> tags:  To get or have the streaked or swirled appearance of certain types of marble, for example due to the incomplete mixing of viscous ingredients, or the uneven application of paint or other colorants.