Castor Oil is the oil from the castor bean and is a colourless/pale yellow-greenish liquid. It is a fixed oil obtained by expeller pressing and then refining from the seeds of Ricinus Communis.  
It is used in Cold Process soap making at usually a maximum of 5-10% and even then this will depend on the other ingredients.  Too much, and your bar will be sticky and too soft.  It is important to note that many soapers will say that using Castor Oil will speed up the trace stage. 

Highlights

• it is a humectant meaning that when it is used in a product it will help it retain moisture
• perfect for rubbing straight onto your lips and your nails and cuticles
• available in 1 litre bottles with quantity discounts available
• high in antibacterial and antifungal properties
• suitable for vegetarians and vegans

 Recommended for

• lip balms and lip gloss
• helping your cold process soaps get a good lather
• can be used for removing moles from your garden?  but we haven't tested this
• skin care products including products for sunburn and acne

Don't forget

• this is very thick and gloopy so don't spill it by accident
• INCI: Ricinus communis