It is very rare for the solution and the cream to be used up at the same time, as the quantities of solution applied are variable whereas the quantities of cream are fixed. We therefore have a situation of mathematical improbability. The quantity of acid to be applied on the face to achieve the first spots of whitening varies according to the thickness of the skin and its state of hydration: a fine, dry skin will need fewer layers than a thick, oily skin.

The amount of solution has therefore been overestimated, on the assumption that you will be treating mostly oily skins.
The quantity of creams, on the other hand, is fixed: whether the face is dry or oily it will always require the application of two grams of post-peel cream.

So, assuming that you are treating mostly fine, dry skins, you will be left with a net surplus of acid solution compared with the cream. The extreme case would be that of a doctor treating only the décolleté area using the abrasive method and therefore no acid. Such a doctor would under no circumstances be using Easy TCA solution and would therefore use up the tube of Easy TCA post-peel cream before even having started the first flask of solution.

The number of peelings allowed for (24 facial peelings) in fact corresponds to the quantities of cream in the tube (fixed) and not the quantities of acid solution (variable).

So, what should you do with the left-over solution? The answer is that it is useless without the post-peel cream and should therefore be thrown away.