Caustic soda, also known as caustic soda and caustic soda, is actually sodium hydroxide.

Because it is a strong alkali with strong corrosiveness, and it is deliquescent, absorbing water vapor in the air will deliquescent and react with carbon dioxide in the air to deteriorate, so Lu Juan explained that spring apricots must be stored in special containers.

After Lu Wan finished speaking, he took the freshly picked petals to the small kitchen. The heating of soap also requires an open flame, so it is more convenient to prepare it in the kitchen.

When the two of them sneaked into the small kitchen, it had already been cleaned by the cook and Qiuyue. Food is also put away to prevent the volatilization of toxic substances.

Lu Juan put the flower basket in his hand on the stove, and then washed the petals with water, first of all, the purification of the petals, which is the same as the purification of essential oils.

Lu Wan mashed the petals with a grinding rod and poured them into a round-bottom flask, and the condenser tube was connected to the water tank, and clean water was added to the water tank.

Finally, the round-bottom flask is heated with an alcohol lamp, and after more than an hour of distillation, the evaporated droplets are collected.

"Sister Chunxing, what is the princess doing?" Qiu Yue was the first time she saw her, she was very curious, and she didn't dare to ask Lu Xuan, so she could only ask in a whisper behind Chun Xing.

"The princess said that this is called distillation, and distillation can separate volatile and non-volatile substances, and can also separate liquid mixtures with different boiling points." Chun Xing also replied in a low voice.

"What does that mean?" Qiu Yue asked stupidly.

I don't blame her, I can't understand the professional terminology.

"I don't quite understand, that's what the princess said before, anyway, it can distill pure liquid, and these juices can make things that maintain the fragrance of flowers." Chunxing shrugged.

Once Lu Wan does things, she will fall into extreme concentration, she first purifies the roses, a basket of petals, and then proposes a porcelain bottle of concentrated essential oil.

I took a cup of about 150 milliliters, added six grams of coconut oil and five milliliters of ultra-pure alcohol, and then ten milliliters of caustic soda.

Caustic soda is first added to hydrochloric acid to check whether it is deteriorating, and then melted water, caustic soda melts well in water to form an alkaline solution.

Lu Juan's subordinates did not stop, quickly stirred evenly, soaped for another 10 minutes, saponified through water, let stand for 5 minutes, and repeated this process until the oil-water separation occurred.

Then drip in the essential oil of rose, and finally pour it into a mold.

"Master, is this done?"

"Hmm," Lu Wan removed the gloves, and Chunxing next to him had already prepared clean water.

Lu Wan put his slightly warmed hand into the copper basin.

"Let's do this today, these soaps don't need to be cut first, and then put them away after solidifying."

"How long does it take?" Chunxing took the container and asked cautiously

"It takes at least half a month to use it." Lu Wan wiped his hands with a brocade hand.

"Yes, Princess, it's already midday, are you hungry? The small kitchen has been occupied, and the cook can't cook. Chun Xing's expression was a little anxious.

Lu Wan will forget the feeling when he is doing things, and when he is idle at this time, he feels hungry, and in the morning because he is too embarrassed and has no appetite, he takes two bites, but he is hungry and uncomfortable at this time.

At this time, Forsythia hurriedly ran over with a good mahogany food box.

"Princess, princess, the prince ordered someone to send a meal from the imperial dining room." Lu Wan was slightly surprised, so coincidental? Mo Xie has set up surveillance in her spare house......