To mix this product, it is best to have it in a bowl or a mixer and have the product moving while adding scent and colour. You do not have the machine too high, just enough that the scent or colour will fold in on itself. In time, the whole batch will come out scented and the same tone.

This product can accept 1% of fragrance and still flow. Adding higher quantities or additional oils or botanicals will make it a little wet and over time might clump. It's more appearance related and won't affect performance.

The following are not dire consequences, just tips to make you aware of some problems that might occur.

What package you put your product in has to be considered. Essential oils, especially the rosin based products, interacts with plastic and will soften the package. Pick a PET-G plastic for clear products and keep your eye on frosted bottles to see if there is any effect. Your manufacturer or distributor can help you select the proper type. Fragrances are not known to have any adverse effects on plastics.

Colour can be tricky in salt within clear containers. UV light reacts quickly and can "bleach" the colour if exposed continuously. The actual colour you select is also of concern, red and blue have a more difficult time. Pigments work better than FD&C for these colours. If unsure, pick frosted if you don't want to worry that much, or use colours without red or blue. Occasionally, you might find a container with a UV inhibitor already in the plastic, these however, are not easy to find. Testing and determining how much colour to add for product stability is up to you. Like most things, don't rush into something without a little trial and error.