How to Read a Soap Label: TFM, INCI Names and BIS Grades

A soap label tells you what a bar is mainly through its ingredient list and its declarations, not its front panel. Read the list from the top: names such as sodium olivate show that oils were saponified into soap, while a list built on surfactants describes a syndet. Indian packs should also carry the month and year of manufacture.

How do you read a soap ingredient list?

Read only the first three or four ingredients. Ingredients are listed in descending order, so the top lines are most of the bar. Under the Cosmetics Rules, 2020, ingredients above one percent are listed in descending order of weight at the time they are added, followed by the rest in any order.

That wording matters. A list that reads olive oil, coconut oil, water and sodium hydroxide follows the rule’s “as added” order. A list that reads sodium olivate and sodium cocoate names what the reaction produced. Both are used, as the next section explains.

What do INCI names like sodium olivate mean?

INCI names are standard cosmetic ingredient names, and for soap they name the sodium salt of an oil’s fatty acids. Sodium olivate is listed as olive oil fatty acids, sodium salts. The pattern is oil name plus “ate”: the Cosmetic Ingredient Review defines sodium castorate as the sodium salt of castor seed oil fatty acids.

A trade guild explains that makers can declare what goes into the pot or what comes out: oils and lye, or names such as sodium olivate, sodium palmate and sodium cocoate. Both can be legitimate. Sodium hydroxide on a list is not leftover lye, because the reaction consumes it.

How can you tell soap, a melt and pour base and a syndet bar apart?

Three kinds of bar look alike on a shelf and read very differently on a label. True soap lists oils and lye or sodium-ate names. A melt and pour base leads with glycerine, sorbitol or propylene glycol. A syndet lists synthetic surfactants. The table shows what each first line usually looks like.

In the US, the FDA treats a product as soap only if the bulk of its non-volatile matter is an alkali salt of fatty acids and it is labelled solely as soap. The pH also differs: in one survey of 96 products, bar soaps measured pH 8.01 to 11.01 and syndets 4.99 to 7.78. See why real soap is alkaline.

For how handmade methods differ, see cold process, melt and pour and hot process.

What does TFM mean on a soap bar?

Total fatty matter, or TFM, is the share of a soap’s weight that is fatty acids. It is defined as the fatty matter that can be separated from a sample after splitting with a mineral acid. IS 2888 requires the pack to state it and sets a minimum for each grade, so it is a useful number for comparing bars.

All three rows come from IS 2888:2004, which allows only perfume, moisture, colouring matter, preservatives, medicaments and declared substances besides the soap itself. For scale, pure dry sodium oleate has a TFM of 92.8 percent, and low TFM is generally associated with fillers.

What must an Indian soap label show?

An Indian soap pack must carry several declarations from three sources. The Cosmetics Rules, 2020 require the manufacturer’s name and address, a manufacturing licence number, and, for soaps, the month and year of manufacture in place of a batch number. Legal Metrology adds the net quantity and price.

• Cosmetics Rules, 2020: the ingredient list for packs above 30 g, the net contents, and the licence number, with IS 2888 for toilet soap and IS 13498 for bathing bars listed in the Ninth Schedule.
• Legal Metrology (Packaged Commodities) Rules, 2011: the name and address of the manufacturer or packer, the generic name, net quantity, month and year of manufacture, and the retail sale price inclusive of all taxes, plus a contact for consumer complaints.
• IS 2888: the grade, net mass, batch or lot number, year and month of manufacture, total fatty matter and any other ingredients.

These rules have been amended since they were first notified, so check the current text for a legal question. A pack missing these items is a reason to ask questions.

Which marketing words on a soap label mean nothing?

Several popular label words carry little information because the Indian rules do not define them. The Cosmetics Rules, 2020 contain no definition of natural, herbal or handmade as product claims. They prohibit any claim that is false or misleading, and the ASCI Code expects claims to be capable of substantiation.

• Natural, herbal: not defined in the Rules text, so they limit nothing.
• Organic: not defined as a product claim in the Rules text, so treat it as meaningful only if a certifying body is named.
• Chemical-free: impossible, because water is a chemical.
• Handmade: not defined in the Rules text. Melting a purchased base by hand could also be called handmade.
• Cold pressed: describes how an oil was extracted, not how the soap was made.
• pH balanced: soap bars measured above pH 8 in the survey above, so a bar claiming a skin-like pH is probably not soap.

Which label words do carry information?

Specific, checkable words are the useful ones. Cold process or hot process names a method. The manufacture date is a legal item for soap. A named certifier or licence number can be checked. Net quantity lets you compare price per gram. TFM and the grade compare bars directly, and a stated oil blend shows what the maker chose.

Two example labels, read

Two worked examples show the method in practice. Each label below was written for this guide and is not copied from any product. Read the first three entries, decide whether polyols, surfactants or sodium-ate names lead, and then check the rest of the list for colourants, clays and scent.

Label A: Glycerin, sodium stearate, sorbitol, propylene glycol, sodium laureth sulfate, water, fragrance, mica. Polyols and surfactants lead, so this reads as a transparent melted base, not soap made from oils.

Label B: Sodium olivate, sodium cocoate, water, glycerin, sodium castorate, Lavandula angustifolia oil, kaolin. Saponified oils lead, so this is soap that somebody made, with olive first and coconut second. For the clay, see cosmetic clays compared.

What should you ask a maker?

A real formulator answers these quickly: the oil blend, the cure time and the superfat. Cure times run to several weeks, and the reasons are in how long soap needs to cure. The superfat is the share of oil left unreacted, explained in superfat and lye discount. Ask also where the scent comes from.

The one-glance version

Read the first three ingredients. Sodium-ate names or oils plus lye mean soap that somebody made, polyols and surfactants mean a remelted base or a detergent bar, and an Indian pack should show a TFM, a grade and a manufacture date. The back of the pack is regulated, and the front is not.